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...

admin

exchange

office 365

security

Christian Taveras

Iron Contributor

Nov 05, 2019

Our issue was mainly with Outlook 2016 client on Windows 10. Long story short, Outlook was communicating to o365 using Modern Auth, but Basic auth. Ran MS SARA which was flicking a switch somewhere in the windows profile which addressed our issue. As far as the outlook app goes. I have pushed a modern Auth Mail Profile to Android and IOS using Itunes without issue.

Doing this the APP is now using the users network pass instead of the APP Password.

Afisher25

Copper Contributor

Dec 20, 2019

This is how we fixed the issue.

Fix 1 was go to a different PC and setup outlook then export KEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity and then go to the PC that is not working and delete all the keys from within this directory and then import the exported file from the working PC.

Fix 2

We went to KEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity and removed these entries in the registry.

"ConnectedAccountWamAad"="eba13797-f788-4703-be3b-eb3bcd516147"

"ConnectedWAMIdentity"="eN64CdJkOrIQs11PRFgzde4uBi5v7oEeiNK5ZF4JXFk"

"DisableADALForExtendedApps"=dword:00000000
"DisableADALSetSilentAuth"=dword:00000000

"DisableHttpRequestWinTimings"=dword:00000000

"DisableSessionAwareHttpClose"=dword:00000000

"EnableADAL"=dword:00000000

"Mso99lUpdatedForADALExtendedApps"=dword:00000001

"msoridDisableOstringReplace"=dword:00000000

"msoridDisableGuestCredProvider"=dword:00000000