Error Approval request Failed to validate the signature

[ivanas]

Hello,

One user have a problem when he wants to approve/decline Approval request. Approval request is coming from Power Automate flow, and both on his phone and laptop he gets this error: Failed to validate the signature of the actionable message card.

He didn't have this problem until couple of days ago. Can you help me with this issue?

[PeteBradburn]

We are also seeing this within Outlook on the web. The user is using the One Outlook Preview.

[PowerDash]

same issue here, it is happening not for all users, just for some.

[Cgrady]

Any update on this issue? One of my users just starting experiencing this today.