Outlook won't connect anymore (O365 & Win 10 Pro)

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I have O365 with Windows 10 Pro...since two weeks ago I can no longer connect to my email in Outlook.  Webmail still works, so I know the password is correct.  I have a 2nd user with a new laptop, same setup, that also can't.  It just keeps asking for UN/PW.  I've done an online repair of Office and also uninstalled and reinstalled completely.

I've also tried running the Office repair tool from Microsoft with no luck.

Anyone else experiencing this issue and have a fix?

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Saif ShaikhServer engineer

R u using onpremise exchange server, then add the ExcludeExplicitO365Endpoint in the registry.

Most Valuable Expert 2015
Distinguished Expert 2018

What does the prompt look like? Do you have MFA enabled, or any other form of two-factor auth?


I've tried adding the account through Outlook and through Mail in Control Panel...neither will work...this is the error in Outlook


Tried turning off MFA...same error unfortunately
Jackie Man IT Manager
Top Expert 2010

Turn on MFA and use application password instead of your password to logon.

NoahHardware Tester and Debugger

Hi there! :)

You can try using the Office 365 Support and Recovery Assistant tool which is an official product used to diagnose and fix several Outlook problems. You may refer to following link provided by the official Microsoft Support Team.

Reference: https://support.office.com/en-us/article/about-the-microsoft-support-and-recovery-assistant-e90bb691-c2a7-4697-a94f-88836856c72f
Thanks for the help guys.  I ended up updating Office and Win10.  After Win10 update the account was able to connect.  Not sure what was hanging it up but must have been a one-off type issue.

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