Failed to validate the signature of the actionable message card Power Automate
Power Automate approval flow has an error " Failed to validate the signature of the actionable message card" once click on a button to submit a comment. particular flow is still running. please support.
I have created another new flow using a similar process and the same error occurred.
Solution
This seems a known OPEN issue with Microsoft: MF491924. The impact seems global and with their product team currently for a fix.
The approval will work well if you use the Teams App as a workaround until the issue is fixed. Since the approval task itself is impacted, creating a new FLOW will also end up with same error.
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- Failed to validate the signature of the actionable message card Power Automate