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Power Automate: Authorization error on shared mailbox in Exchange

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Posted on by NO-08080930-0

I'm setting up a flow in Power Automate using the trigger "When a new email arrives in a shared mailbox (V2)". I have read and manage permissions on the shared mailbox assigned from the Microsoft 365 Admin Center, and the mailbox is already visible in my Outlook.

When the flow runs, I get this error:

"You are not authorized to perform this operation. This error can occur in sandbox (trial) accounts or if the Exchange server administrator has disabled OData operations."

Environment: Microsoft 365 Business

The shared mailbox does NOT have a license assigned

Permissions were assigned full access

Is this an OData permissions issue in Exchange, a propagation delay, or is there something else to configure? How can OData operations be enabled from the Exchange admin center?

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Ellis Karim 12,236 Super User 2026 Season 2 on at

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Hi, @NO-08080930-0

If "Full Access" was assigned to you recently, it can take while this change to sync to the Power Platform.

A shared mailbox can store up to 50 GB of data without assigning a license to it.

Try: deleting or refreshing the connection reference, either in the Connections menu or the settings for the action:

See also: How to Send Emails from a Shared Mailbox in Power Automate (Without Giving Up Privacy) – Ellis Karim's Blog

Ellis Karim
elliskarim.com | LinkedIn | Bluesky
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Haque 4,004 Super User 2026 Season 2 on at

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Hi @NO-08080930-0,

After assigning permissions, it can take up to 24 hours for changes to propagate (Delays in provisioning) fully across Exchange Online and Power Automate services.

<cite>The service typically takes less than 30 minutes to provision a user or to sync changes for a user. However, in some situations these processes can take up to 24 hours. </cite>

In case the tenant is in GCC - need to confirm with MS support if OData operations are restricted or require any special configuration or not.

Sometimes some Exchange online tenants or GCC tenants restrict OData operations and disabled for security or compliance reasons.

Regarding the permission-things need to be aware of:

The user who is running the flow must have Full Access permission on the shared mailbox (usually assigned vai Ex. Online PowerShell or the EAC (Ex. Admin Center). Hence, user should have Folder Visible permissions on the mailbox root and Editor or higher permissions on the Inbox folder. Please note that sometimes, assigning Full Access alone is not enough; you may need to explicitly set folder-level permissions on the Inbox and root folder.

References:

Permission on Exchange Online

Mailbox and folder permission

Review and manage permissions

I am sure some clues I tried to give. If these clues help to resolve the issue brought you by here, please don't forget to check the box Does this answer your question? At the same time, I am pretty sure you have liked the response!

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NO-08080930-0 9 on at

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Thanks everyone, problem solved.

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Ellis Karim 12,236 Super User 2026 Season 2 on at

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@NO-08080930-0.

Glad to hear you got it resolved.

Please could you share what the solution was? It would be really helpful for anyone who finds this thread later with the same shared mailbox authorisation issue in Power Automate.

Thanks!

Ellis Karim
elliskarim.com | LinkedIn | Bluesky
If this solved your issue, please mark it as ✅ Accepted Answer. If it helped, feel free to give it a 🩷 Like!

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NO-08080930-0 9 on at

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I granted myself full access permissions and waited 24 hours; after that, it worked.

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Greg Prickril 169 on at

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Issue

Power Automate returned an authorization error when using the “When a new email arrives in a shared mailbox (V2)” trigger, despite the mailbox being visible in Outlook.

Cause

Full Access permission had only recently been assigned and had not yet propagated across Exchange Online and Power Automate. The unlicensed shared mailbox was not the problem.

Fix

Grant the flow owner Full Access to the shared mailbox and allow up to 24 hours for the permission change to propagate. Refresh or recreate the Power Automate connection if the error persists.

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