Multiple recipients are not supported by the "Post card in a chat or channel" action when posting as Flow bot/Microsoft Copilot Studio agent

[v-rajimandal]

Type of issue

Missing information

Feedback

Hi Team,

When using the "Post card in a chat or channel" Power Automate action with Post as = Flow bot or Microsoft Copilot Studio agent, multiple recipients are not supported. However, the action still allows users to specify multiple recipients. When the flow runs, it fails with a Bad Request error.

This appears to be the intended (by-design) behavior, but we could not find any documentation that clearly states this limitation.

Reproduction Steps:

1. Create a flow with a Manual trigger.
2. Add the "Post card in a chat or channel" action.
3. Set Post as to Flow bot or Microsoft Copilot Studio agent.
4. Set Post in to Chat with Flow bot or Chat with agent.
5. Specify multiple recipients in the Recipients field.
6. Run the flow.

Expected Behavior:

• Either the action should support multiple recipients, or it should validate the input and prevent multiple recipients from being selected.

Actual Behavior:

• The action accepts multiple recipients but fails at runtime with a Bad Request error, without clearly indicating that multiple recipients are not supported.

Could you please update the documentation to explicitly state that multiple recipients are not supported for this scenario?

Page URL

https://learn.microsoft.com/en-us/power-automate/create-adaptive-cards

Content source URL

https://github.com/MicrosoftDocs/power-automate-docs/blob/main/articles/create-adaptive-cards.md

Author

ms.author

Document Id

NA

Platform Id

NA

[m365-agent-toolkit-assistant]

👋 Hi @v-rajimandal,

Thank you for reporting this issue! We want to let you know that:

⏱️ Our team will personally review your issue
🎯 You can expect a response within 1 business day

✨ This is an AI-generated initial response
🤖 AI-Generated Preliminary Analysis:

Classification: By design — the docs consistently describe a single recipient for Flow bot / Copilot Studio agent chat scenarios, so the runtime failure is consistent with a single-user model; the gap is missing validation/docs clarity.

• Learn docs for Flow bot say “post … to a specific user” and require “a recipient email address,” singular.
• Copilot Studio proactive message docs likewise say Recipient = recipient’s name or email address, singular, for Chat with agent.
• No doc found that says multiple recipients are supported for Chat with Flow bot / Chat with agent.
• Similar issue search did not find another matching tracked doc bug in the searched repo.

What to do now:

1. Treat Recipients as single-value for these two modes.
2. If you need multiple people, loop over recipients or create a group chat first, then post to that chat.
3. Update the doc/UI to explicitly state this limitation and/or validate input.

Useful links:

• No similar issues found in the searched repos.
• https://learn.microsoft.com/power-automate/overview-adaptive-cards
• https://learn.microsoft.com/microsoft-copilot-studio/advanced-proactive-message#send-a-proactive-adaptive-card
• https://learn.microsoft.com/power-automate/teams/send-a-message-in-teams#create-a-new-group-chat-and-post-a-message-to-it-as-the-flow-bot

If you want, I can help draft the exact doc wording.

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Note: This is an automated first response generated by AI. A human team member will review your issue and provide a more detailed response soon. We appreciate your patience!

[microsoft-github-policy-service]

Hi @v-rajimandal! We will investigate and if we require further information we will reach out to you. Please use this link to escalate if you don't get replies in two working days.

Best regards, Teams Platform