Login denied (possible manual token revocation). Please reauthorize from frontend

[jloria]

Hi We are having an issue using Zabbix 7.4, we set up the email notifications using MS365 oauth. Configuration works fine for 1 hour and then we get this error message failed to send email: Login denied (possible manual token revocation). Please reauthorize from frontend. We have checked every single setting in Zabbix and MS Entra app, and all looks fine but we still hace the same issue. Has anyone come accross this? What can we do? Thank you

[the__alpaca]

I have the exact same issue/error with Microsoft365 OAuth. OAuth authentication flow works well when configuring, but when doing a test, I get the error: Login denied (possible manual token revocation). Please reauthorize from frontend.