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Started to get Failed to validate the signature of the actionable message card.

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Posted on by allanneoh

Hello,

Is anyone else getting the "Failed to validate the signature of the actionable message card." from approving or rejecting a power automate approval workflow?

It was working for reject then a minute later, the approve and reject would respond with the above error. Can't seem to find any info from the Microsoft Service Health.

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Nived_Nambiar 18,129 Super User 2025 Season 2 on at

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Hi @allanneoh

Did you reffered this ?

https://powerusers.microsoft.com/t5/General-Power-Automate/Failed-to-validate-the-signature-of-the-actionable-message-card/td-p/1753704

https://support.nhs.net/2022/12/microsoft-365-alert-service-degradation-microsoft-power-automate-in-microsoft-365-failures-when-rejecting-or-approving-microsoft-power-automate-email-approvals/

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Nived N 🚀

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allanneoh 2 on at

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Yes. Points to a problem with Microsoft service misconfiguration. Not user error nor engineer error.

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DP-02060235-0 2 on at

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We are seeing this also. We are not using Power Automate or Teams, this is a pure C# and Outlook/Exchange environment.

Restarting Outlook fixes it every time.

Edit: We suspect this is happening to our development team only, because we have multiple accounts in Outlook. We reckon that occasionally Outlook sends the Bearer token from the wrong account. Users with single accounts have not reported it.

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