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Power Platform Community / Forums / Power Automate / Help Sending Actionabl...
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Suggested Answer

Help Sending Actionable Messages From a Shared Mailbox With Power Automate

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Posted on by 50

I've created a flow in power automate that sends an actionable message from a shared mailbox. The flow runs without error and the actionable message is received by the recipient. The issue I'm having is the autoInvokeAction does not run when the email is opened.

I've tried creating a new provider with my email address as the Sender email address and changing the flow so the email is sent from my account. This fixes the issue and the autoInvokeAction runs when the email is opened. But if I change back to the shared mailbox, I run into the same issue. The only change I make in the actionable message is changing the originator.

My goal is to send actionable messages so they appear from a service type address rather than my own address. Maybe this isn't possible with a shared mailbox and I need to create a service account?

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  • Suggested answer
    Fredrik_A Profile Picture
    3,566 Super User 2026 Season 1 on at
    Hello,
     
    you cannot send actionable messages to anyone but yourself unless you register via the actionable message developer dashboard.
     
     
    If my response solved your issue, please mark it as ✅ Accepted Answer and give it a like.
  • russellhq1 Profile Picture
    50 on at
    Thanks for this @StretchFredrik. I have registered the provider and am able to send actionable messages from the shared mailbox to the test users I've listed in the provider settings. But when they open the message, the autoInvokeAction does not run to update the card.
  • Fredrik_A Profile Picture
    3,566 Super User 2026 Season 1 on at
    Hello,
     
    can you please share your actionable message JSON?
  • russellhq1 Profile Picture
    50 on at
    Here's the JSON for the actionable message. This sends OK from the Flow when I "Send As" the shared mailbox. But when the recipient opens the email, they see the actionable message, but it doesn't run the autoInvokeAction to update the message.
     
    I've hidden some of the details that are not relevant with "xxx"
     
    {
        "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
        "type": "AdaptiveCard",
        "version": "1.0",
        "hideOriginalBody": true,
        "autoInvokeAction": {
            "method": "POST",
            "url": "xxx",
            "body": "xxx", 
            "headers": [
                {
                    "name": "Authorization",
                    "value": ""
                },
                {
                    "name": "Content-Type",
                    "value": "application/json"
                }
            ],
            "type": "Action.Http"
        },
        "body": [
            {
                "type": "Container",
                "id": "2e59d670-1739-2cc4-5e30-6cea80f59d26",
                "padding": "None",
                "items": [
                    {
                        "type": "ColumnSet",
                        "id": "dbd9eea6-8ae1-396e-930f-4415cb842fab",
                        "columns": [
                            {
                                "type": "Column",
                                "id": "ba1a0e9f-1c6a-3438-e490-6a771fc9c8f6",
                                "padding": "Medium",
                                "width": "stretch",
                                "items": [
                                    {
                                        "type": "TextBlock",
                                        "id": "4b4df01d-3513-bd7f-15e0-84b7761bc773",
                                        "text": "xxx",
                                        "wrap": true,
                                        "horizontalAlignment": "Left",
                                        "size": "ExtraLarge",
                                        "weight": "Bolder",
                                        "color": "Light"
                                    }
                                ],
                                "verticalContentAlignment": "Center"
                            },
                            {
                                "type": "Column",
                                "padding": "None",
                                "width": "auto",
                                "verticalContentAlignment": "Center",
                                "items": [
                                    {
                                        "type": "Container",
                                        "id": "cbb25bf7-afa0-17c0-ff76-86a36effc68d",
                                        "padding": "Small",
                                        "verticalContentAlignment": "Center",
                                        "items": [
                                            {
                                                "type": "Image",
                                                "id": "34b6ab7b-258c-b89e-18e8-dabbf166a0b3",
                                                "url": "xxx",
                                                "altText": "Company Logo",
                                                "size": "Medium",
                                                "horizontalAlignment": "Right"
                                            }
                                        ],
                                        "style": "default",
                                        "spacing": "None",
                                        "backgroundImage": {
                                            "url": "xxx",
                                            "fillMode": "Repeat"
                                        }
                                    }
                                ]
                            }
                        ],
                        "padding": "None"
                    }
                ],
                "backgroundImage": {
                    "url": "xxx",
                    "fillMode": "Repeat"
                }
            },
            {
                "type": "Container",
                "id": "535ff5b5-2ac3-03f7-51a2-c1791957d8f3",
                "padding": "Medium",
                "spacing": "None",
                "items": [
                    {
                        "type": "FactSet",
                        "id": "9526f3db-13ad-dcaa-32a2-b55e98647fa8",
                        "facts": [
                            {
                                "title": "xxx",
                                "value": "xxx"
                            },
                            {
                                "title": "xxx",
                                "value": "xxx"
                            },
                            {
                                "title": "xxx",
                                "value": "xxx"
                            },
                            {
                                "title": "xxx",
                                "value": "xxx"
                            },
                            {
                                "title": "xxx",
                                "value": "xxx"
                            },
                            {
                                "title": "xxx",
                                "value": "xxx"
                            }
                        ],
                        "spacing": "Large"
                    }
                ]
            },
            {
                "type": "Container",
                "id": "cf6bafb5-3a7c-3566-0d94-44f9be459ef2",
                "padding": "Medium",
                "style": "default",
                "spacing": "None",
                "items": [
                    {
                        "type": "Container",
                        "id": "3fecedcb-6bf9-069f-dceb-96b81b17cff8",
                        "padding": "Default",
                        "items": [
                            {
                                "type": "TextBlock",
                                "id": "c9746c50-d249-2a1a-d094-9bfd70bdf954",
                                "text": "xxx",
                                "wrap": true,
                                "isSubtle": true
                            },
                            {
                                "type": "TextBlock",
                                "id": "55057396-0029-e06a-ff87-ed402529d734",
                                "text": "",
                                "wrap": true
                            }
                        ],
                        "style": "emphasis"
                    }
                ]
            },
            {
                "type": "Container",
                "id": "468d05f4-681c-36f7-a4b9-5950c66a882b",
                "padding": "Medium",
                "spacing": "None",
                "items": [
                    {
                        "type": "TextBlock",
                        "id": "f6af3936-bbf1-b9ca-1b7b-f04daa1ae5fe",
                        "text": "xxx",
                        "wrap": true
                    }
                ]
            },
            {
                "type": "Container",
                "id": "1d463bb9-dcd8-6abc-7c00-39966a48efb1",
                "padding": "Medium",
                "spacing": "None",
                "items": [
                    {
                        "type": "ActionSet",
                        "id": "cbe4242a-f7df-3a94-73ec-7e48e3212386",
                        "actions": [
                            {
                                "type": "Action.OpenUrl",
                                "id": "9732bf10-346a-699c-9911-65b6242e5681",
                                "title": "xxx",
                                "url": "xxx",
                                "style": "positive",
                                "isPrimary": true
                            },
                            {
                                "type": "Action.ShowCard",
                                "id": "0e816ed6-3f1a-b2eb-613a-a4a86ecd7d60",
                                "title": "xxx",
                                "card": {
                                    "type": "AdaptiveCard",
                                    "padding": "None",
                                    "$schema": "http://adaptivecards.io/schemas/adaptive-card.json",
                                    "body": [
                                        {
                                            "type": "Container",
                                            "id": "eecc8fc6-69d4-a3a6-9684-643354bddbb2",
                                            "padding": "None",
                                            "style": "default",
                                            "items": [
                                                {
                                                    "type": "Container",
                                                    "id": "8beb8713-93fb-5826-ebb5-0e4f61c3031e",
                                                    "padding": "Small",
                                                    "items": [
                                                        {
                                                            "type": "TextBlock",
                                                            "id": "a1d3d4fe-642f-f519-e309-50361282cabd",
                                                            "text": "Comments:",
                                                            "wrap": true,
                                                            "isSubtle": true
                                                        },
                                                        {
                                                            "type": "Input.Text",
                                                            "id": "93fb7de9-2f86-cc0d-1778-2bc5b8cfd259",
                                                            "placeholder": "Approver's comment",
                                                            "isRequired": true,
                                                            "isMultiline": true
                                                        },
                                                        {
                                                            "type": "ActionSet",
                                                            "id": "98218bc9-b968-2224-11f5-4e95d627ae47",
                                                            "actions": [
                                                                      {
            "type": "Action.Http",
            "title": "Submit",
            "method": "POST",
            "url": "xxx",
            "body": "xxx", 
                "headers": [
                    {
                        "name": "Authorization",
                        "value": ""
                    },
                    {
                        "name": "Content-Type",
                        "value": "application/json"
                    }
                ]
          }
                                                            ]
                                                        }
                                                    ],
                                                    "style": "emphasis"
                                                }
                                            ]
                                        }
                                    ]
                                }
                            }
                        ]
                    }
                ],
                "verticalContentAlignment": "Center"
            },
            {
                "type": "Container",
                "id": "06cfb532-f978-43c1-e020-23fb11961b12",
                "padding": "None",
                "isVisible": false,
                "items": [
                    {
                        "type": "Input.Text",
                        "id": "id_project_name",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_project_number",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_requested_by",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_date_requested",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_project_stage",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_approval_type",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_phase_id",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_approval_id",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_approver_email",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_stage_ready_to_complete",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    },
                    {
                        "type": "Input.Text",
                        "id": "id_stage_id",
                        "placeholder": "Enter text here",
                        "value": "xxx"
                    }
                ]
            }
        ],
        "padding": "None",
        "originator": "xxxx"
    }
     
     
     
  • Suggested answer
    Fredrik_A Profile Picture
    3,566 Super User 2026 Season 1 on at
    Hello,
     
    where is the recipients engaging with the message? It has to be on the Outlook web app or the new Outlook version on windows. 
     
    Is your authorization header actually empty, or did you just empty it to paste it here? 
     
    Also, can we try changing the card to version 1.4 or similar to see if that changes anything?
     
     
  • russellhq1 Profile Picture
    50 on at
    Recipients are using Outlook (not the new version) on Windows.
     
    Yes, the Authorization Header value is empty. I followed this guide when setting up the actionable message:

    Actionable Outlook Messages. A Complete Step by Step Guide | by Premkumar Sriram | Digital Solutions — Retail & CPG | Medium

     
    I tried changing the card version to 1.4 and sending from my address (which was working). This breaks how the card looks and also doesn't run the autoInvokeAction.
     
    The link below looks like adaptive cards only go up to version 1.2.  I tried version 1.2 and the card didn't render. I tried version 1.1 from my account and the card rendered and autoInvokeAction runs as well. I tried 1.1 from the shared mailbox and the card rendered but autoInvokeAction doesn't run.
     
  • Fredrik_A Profile Picture
    3,566 Super User 2026 Season 1 on at
    Thanks for the answer,
     
    seems very weird. Im kind of out of ideas, if anyone else has any ideas please fill in.
     
    I asked Co-pilot and it gave me the following troubleshooting steps, maybe you can give those a shot?
     
    Permissions or identity context: Shared mailboxes may not have the same identity context or capabilities as user accounts.
    Security restrictions: Some environments restrict auto-invoked actions from shared mailboxes to prevent abuse.
    Rendering differences: The client may treat cards from shared mailboxes differently (e.g., Outlook desktop vs web).
  • russellhq1 Profile Picture
    50 on at
    Thanks for all your help. All the searching and ai I've tried focuses on sending to shared mailboxes, which suggests that's not supported. There's very little I can find on sending from shared mailboxes, or how to set them up. It is odd that message sends but the autoInvokeAction isn't triggered.
  • Suggested answer
    russellhq1 Profile Picture
    50 on at
    OK, I got this working now. So, looks like what's happened is, I had moved my Flow that responds to the autoInvokeAction into a solution and that changed the HTTP trigger URL for some reason (maybe by design). I hadn't noticed this and so didn't change the target URL in the provider or the autoInvokeAction URL in my actionable message.
     
    But for some reason, the old Flow URL was still responding to the API call from autoInvokeAction, but only when the actionable message was sent from my email address.
     
    A.I. then sent me down the road of using outlook for the web and using the network trace. This showed that the autoInvoke was getting triggered in the email from the shared mailbox, but the response was: Target URL is not allowed.
     
    When the actionable message email was sent from my address, the response was: The remote endpoint returned an error (HTTP '502'). Please try again later.
     
    This prompted me to check the Target URLs again in the provider and the Flow, even though they were still working with my email address.

    That took me most the afternoon to figure out!
     
    So, to get it working, I created a new provider, added the new Flow HTTP URL, updated my actionable message with the new URL and provider and sent a new message to test.
  • russellhq1 Profile Picture
    50 on at
    This will be why the URL was changed in the flow:
     
     
    Your flow has a new trigger URL
    The flow 'XXXX' uses the request trigger, and its URL was recently changed. Any tools that reference the old URL will break starting November 30, 2025.
    Flow name: XXXX    
    
    Go to my flow >
    
        
    
    Why is this happening?
    We've upgraded the flow runtime, which means the trigger in the Request connector now uses new URLs. To make it easier to update your tools, both the old and new URLs will work during the transition period, which ends November 30, 2025. Learn more. 

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