I'm running a web hook which uses the O365 mangement API to obtain activities for SharePoint. This worked until yesterday 10 PM. Suddenly a call to
using a bearer token is responding with code
503 with a huge timeout of up to 1.5 minutes. I cannot figure out what happened. I even redeployed my API but still no success. If I try direct access using Fiddler it fails too.
EDIT: The key in Azure AD will expire on 9/20/2018.