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After a hybrid migration to Exchange Online Outlook clients not switching over.
Migrating users from Exchange 2010 to O365. Clients are using Outlook 2016 MSI install. After a successful migration, Outlook goes into the "disconnected" state and doesn't prompt for O365 credential...
Rob Axelrod Hello, not in my comfort zone here but I've heard of an almost identical issue before where they disabled MFA (temporarily) to get it to work.
If that's not the case maybe this is applicable
https://support.microsoft.com/en-us/help/3073002/after-migration-to-office-365-outlook-doesn-t-connect-or-web-services
I have a ticket open to look at the conditional access settings. Modern Auth is definately enabled since every other scenario works just fine except for the specific act of transitioning the Outlook client from on prem to the cloud post hybrid finalization. I think the answer is going to be tweaking my conditional access config so that the "Other Clients" setting isn't checked in the policy that requires multi factor.
Rob Axelrod I'm also interested in knowing Ms's response to your ticket. I am doing a migration and I have encountered the same problem. Thanks.