Forum Discussion

Iron Contributor

Oct 16, 2017

Multi-factor Authentication breaks outlook

Just wondering if anyone has run into this issue. I have been Turning on MFA for users a group at a time all was going smooth. The next morning after turning on MFA for the last hand full of u...

Copper Contributor

Apr 12, 2021

I had this issue just now. Problem was that the customer still used RPC instead of MAPI on-prem. Known issue it seems when migrating/connecting to EXO.

See: https://docs.microsoft.com/nl-nl/outlook/troubleshoot/authentication/outlook-prompt-password-modern-authentication-enabled

Jay_Scott

Copper Contributor

Apr 12, 2021

Here is what works for me:

Sign out of Microsoft products (word, onedrive, outlook)
Erase all windows credentials from credentials manager
Open Outlook to confirm the password prompt pops up. (do not enter it, exit Outlook)
Turn on MFA entering the users cell phone
Open outlook and paste in the newly created App Password
Open word, excel, onedrive, teams etc entering the txt codes

I have had success going in that order. Any other way, and or any attemps at bulk enforcement all were met with problems.