u/Kyoto04

After a long and hard struggle with Zabbix's implementation of the Office 365 Media Type and OAuth authentication, I got to a point where supposedly the OAuth authentication works and Test Mails are successfully sent.

However when a trigger should send a mail, it always fails with this error:
"Login denied (possible manual token revocation). Please reauthorize from frontend."

I don't get how a test mail works flawlessly everytime but the automated trigger fails.

My hope is that someone else had this or a similar issue and might be able to give me some pointers.