Power Platform Community Forum Thread Details

I try to use "Post card in a chat or channel" to post messages to channel. But it raise error "The specified Teams flowbot message's message body is invalid JSON."

This is my Compose INPUTS and OUTPUTS:

INPUTS

[
{
"contentType": "application/vnd.microsoft.card.adaptive",
"content": {
"body": [
{
"type": "TextBlock",
"weight": "Bolder",
"size": "ExtraLarge",
"text": "Application ccoecn-action-runners has been successfully synced"
},
{
"type": "TextBlock",
"text": "Application ccoecn-action-runners has been successfully synced at 2025-11-26T05:32:31Z."
}
],
"msteams": {
"width": "Full"
}
}
}
]

OUTPUTS

[
{
"contentType": "application/vnd.microsoft.card.adaptive",
"content": {
"body": [
{
"type": "TextBlock",
"weight": "Bolder",
"size": "ExtraLarge",
"text": "Application ccoecn-action-runners has been successfully synced"
},
{
"type": "TextBlock",
"text": "Application ccoecn-action-runners has been successfully synced at 2025-11-26T05:32:31Z."
}
],
"msteams": {
"width": "Full"
}
}
}
]

And this is the Adaptive Card

[
{
"contentType": "application/vnd.microsoft.card.adaptive",
"content": {
"body": [
{
"type": "TextBlock",
"weight": "Bolder",
"size": "ExtraLarge",
"text": "Application ccoecn-action-runners has been successfully synced"
},
{
"type": "TextBlock",
"text": "Application ccoecn-action-runners has been successfully synced at 2025-11-26T05:32:31Z."
}
],
"msteams": {
"width": "Full"
}
}
}
]

This is the OUTPUTS of "Post card in a chat or channel"

Body

{
"error": {
"code": "InvalidBotRequestMessageBody",
"message": "The specified Teams flowbot message's message body is invalid JSON."
}
}

Headers

{
"Cache-Control": "no-store, no-cache",
"Strict-Transport-Security": "max-age=31536000; includeSubDomains",
"x-ms-islandgateway": "_prdcm001weugb0_5",
"x-ms-igw-tracking-id": "7e531bdf-57be-4e44-adc2-5d1be4c6b06d20251126053324_prdcm001weugb0_5",
"mise-correlation-id": "ced6c83d-36da-4624-a68d-8c9131f4a129",
"x-ms-request-id": "westeurope:1580f939-d00e-4942-9091-388e30e0d229",
"x-ms-correlation-request-id": "fc994979-5ec8-41b0-b779-385390a952b7",
"x-ms-flow-mobile-ios-version": "3.0.421",
"x-ms-armresiliency": "False",
"x-ms-flow-routing-request-id": "WESTEUROPE:20251126T053324Z:1580f939-d00e-4942-9091-388e30e0d229",
"Server-Timing": "x-ms-igw-upstream-headers;dur=108.2,x-ms-igw-req-overhead;dur=0.4",
"X-Content-Type-Options": "nosniff",
"x-ms-service-request-id": "7e531bdf-57be-4e44-adc2-5d1be4c6b06d",
"x-ms-correlation-id": "fc994979-5ec8-41b0-b779-385390a952b7",
"x-ms-activity-vector": "00.00.IN.09.IN.08.00",
"x-ms-client-region": "europe",
"x-ms-flavor": "Production",
"X-Ms-Workflow-Resourcegroup-Name": "720B637A655A40CF816AF22F40755C2C-DEFAULT720B637xxxxxx6AF22F40755C2C-ENV",
"x-ms-workflow-subscription-id": "7d8a3be2-6648-4250-819d-21555dabbdbb",
"x-ms-environment-id": "default-720b637a-655a-40cf-816a-f22fxxxxx2c",
"x-ms-tenant-id": "720b637a-655a-40cf-816a-f22fxxxxxc2c",
"x-ms-subscription-id": "7d8a3be2-6648-4250-819d-21xxxxxdbb",
"x-ms-dlp-re": "-|-",
"x-ms-dlp-gu": "-|-",
"x-ms-dlp-ef": "-|-/-|-|-",
"x-ms-mip-sl": "-|-|-|-",
"x-ms-au-creator-id": "e1f25a55-400d-4338-bfa1-83d7xxxx7a24",
"Timing-Allow-Origin": "*",
"x-ms-apihub-cached-response": "true",
"x-ms-apihub-obo": "false",
"Date": "Wed, 26 Nov 2025 05:33:24 GMT",
"Content-Length": "154",
"Content-Type": "application/json"
}
 

Status Code

400

Below is the configuration of Compose and "Post card in a chat or channel"

Compose code review

{
"inputs": [
{
"contentType": "application/vnd.microsoft.card.adaptive",
"content": {
"body": [
{
"type": "TextBlock",
"weight": "Bolder",
"size": "ExtraLarge",
"text": "@{triggerBody()?['title']}"
},
{
"type": "TextBlock",
"text": "@{triggerBody()?['text']}"
}
],
"msteams": {
"width": "Full"
}
}
}
],
"metadata": {
"operationMetadataId": "734a0335-7d37-4405-9dc4-839xxxxxc45cc"
}
}

"Post card in a chat or channel" code review:

{
"inputs": {
"host": {
"connectionName": "shared_teams",
"operationId": "PostCardToConversation",
"apiId": "/providers/Microsoft.PowerApps/apis/shared_teams"
},
"parameters": {
"poster": "Flow bot",
"location": "Channel",
"body/recipient/groupId": "cd411852-8656-4d58-a2ff-81xxxx3347a",
"body/recipient/channelId": "19:0c9b62cdxxxxxxx5ed3f9fa9c1b263@thread.skype",
"body/messageBody": "@outputs('Compose')"
},
"authentication": "@parameters('$authentication')"
},
"metadata": {
"operationMetadataId": "34433eca-a19e-49b5-ad2e-714cxxxxx09"
}
}

I checked the Compose OUTPUTS, it is valid Json string per https://jsonformatter.curiousconcept.com/# validation result.

I also tried to replace " with ', remove blanks of the Json string. It dose not work.

Categories:

Building flows

HI ,
you can check this link to design the teams card : Adaptive Card Designer

and i think in your card json $schema and version is missing , because of that, it is saying invalid json for card. and also your json is array of json objects.

sample working card json:
{
"contentType": "application/vnd.microsoft.card.adaptive",
"content": {
"body": [
{
"type": "TextBlock",
"weight": "Bolder",
"size": "ExtraLarge",
"text": "Sample Text"
}
],
"msteams": {
"width": "Full"
}
},
"type": "AdaptiveCard",
"$schema": "https://adaptivecards.io/schemas/adaptive-card.json",
"version": "1.5",
"body": [
{
"type": "TextBlock",
"text": "Sample Card Text for Posting in Teams Channel",
"wrap": true,
"weight": "Bolder",
"size": "ExtraLarge"
}
]
}.

sample flow run.