Outlook App Authentication failing

Copper Contributor

We are experiencing Outlook App authentication fails across our organization suddenly.

No changes have been made on our end. 

Is Microsoft having issues or is anybody else dealing with this 

2 Replies
Has security defaults been applied to your Azure AD tenant , blocking legacy protocols?


It may be too late for my reply, btw, what kind of authentication are you using? (e.g. Exchange Active Sync)

How about OWA (Outlook Web App), working?