Reaching out to the hive mind because we’re all stumped.
We have O365 through corporate, Modern Auth and MFA enabled. We recently changed domains (locally, not corp-wide), @foo.bar to @fizz.bar, and have been having trouble ever since. Most times just rebuilding their Outlook profile fixes it, but for some users once it gets to the Modern Auth page, you enter the new email address, it acts like it’s about to go to the password screen, but then it just goes back to the email entry.
It would make sense that users changing email addresses might have to redo their profile, stuff gets clogged, but brand new users who have never logged into anything before are also having this problem.
Windows 10, Office 2016/2019, AD. We’re in a separate forest than corporate, no trust relationships, but our O365 accounts are all managed in their forest that has an AAD sync. Corporate reports we’re the only ones with this issue, which makes sense because we’re the only ones out here changing our email addresses.
Last time I pushed updates was 6/1/2020-ish, it was shortly after Woody moved us to MS-DEFCON 4. Don’t think it was an update, some computers are shared and a few users can use Outlook on it just fine while others can’t. Our DC forwards DNS to corp’s servers, so we’re pretty convinced it’s not DNS.
For some people it did trigger after they had to update their corp password (only once did clearing out Credential Manager fix it). At this point I’m thinking it’s not anything in our environment, something is up with corp’s AAD sync. They use MIM/FIM to manage users and on new accounts when I enable mailboxes I have seen a couple new flags be given values that I know the older accounts don’t have.
Am I missing something glaringly obvious? Any ideas as to what could be going on?
Thanks, all!
JoDrRe
