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Power Automate - Actionable Messages Migration from EAT to MS Entra AAD Authentication

Stephan Bergh 20 Reputation points
2026-04-30T06:30:43.9833333+00:00

Good morning,

Microsoft will be completely retiring EAT Tokens as a method of authenticating Actionable Messages for Outlook (With Adaptive Cards) as of 15 May 2026.

We need to migrate our existing Actionable Email Developer Dashboard providers to MS Entra.

When migrating, we are prompted the following:
"Is this a power automate scenario?". Upon selecting yes, and ensuring everything is correct, I still get "The remote endpoint returned an error (HTTP '401'). Please try again later."

Things to note:

  • My adaptive cards are fine, it renders perfectly.
  • I have "Authorization" as a header and the value is set to "" as per the documentation (Within the Action.HTTP POST of the adaptive card)
  • On button click, a flow is called, this flow is set to "Anyone in tenant"
  • I have a trigger condition as per the documentation on this flow: @equals(triggerOutputs()?['headers']?['Provider-Id'], 'your_actionable_email_provider_id')
  • My originator does match the provider ID, in the flow that sends the HTTP POST request and in the flow thats triggered.

I cant find any documentation online, can someone please assist?

Thank you!

Microsoft 365 and Office | Development | Other
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Answer accepted by question author

  1. Vergil-V 12,530 Reputation points Microsoft External Staff Moderator
    2026-04-30T07:09:55.99+00:00

    Hi @Stephan Bergh   

    At this point, I haven’t been able to find any official documentation that clearly explains the behavior you described.

    Since this forum does not currently have a dedicated Power Platform tag, you may receive more relevant support by posting your question in the Find Answers | Microsoft Power Platform Community.  It is an active community where many experienced members are willing to share their knowledge and practical guidance based on similar environments and deeper domain expertise. 

    Thank you very much for your patience and understanding. 

    Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

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