Outlook 2016 asking for credentials Exchange 2016

I have 1 user in a 100 mailbox environment that is having this issue.  On prem Exchange 2016 server.  User has Office 2016 with all updates.  He is asked for the password every few seconds.  It will still connect and work, but keep asking for the password.  If i set him up in Outlook under his username on any computer that has Outlook 2013, there is no issue.  If I set him up on another computer that has Office 2016, he has the exact same issue.  But, the normal user for that PC, does not have the issue.  I've tried everything in here:  https://www.easypcmod.com/windows-10-outlook-2016-issues-connecting-outlook-com-random-crashes-repeated-credential-prompts-troubleshooting-guide-452 with no luck.  I've reinstalled Office, recreated the profile, etc as well.  Ran SFC /scannow....
Sean RhudyPresidentAsked:
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SeanSystem EngineerCommented:
Any chance he has recently changed his password? if not maybe try to reset it and see if something got screwy with his account password in AD.
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Scott CSenior EngineerCommented:
You could try an Office repair on that machine as the issue seems to stay on that machine.  

What about if another user logs onto that machine?  Do they see the same issue?

You could also un-install/re-install office to see if that has any effect.
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Sean RhudyPresidentAuthor Commented:
Hi Sean, Yes; I've reset his AD password to make sure it didn't expire.

Scott:  I've ran an Office repair.  The issue isn't only on his machine.  If I log him into any other machine that has Office 2016, he has the same issue.  If I log him into a computer with Office 2013, he does not have the issue.
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Scott CSenior EngineerCommented:
Might be an issue with his mailbox itself.

Try running a mailbox repair request.

https://technet.microsoft.com/en-us/library/ff625226(v=exchg.160).aspx

Example:

New-MailboxRepairRequest -Mailbox tony@contoso.com -CorruptionType FolderView
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Sean RhudyPresidentAuthor Commented:
Great idea, just tried it and didn't find any corruption and same issue.
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Sean RhudyPresidentAuthor Commented:
I've narrowed it down to being something with Autodiscover.  I know Outlook 2016 forces the use of autodiscover.  I deleted the local autodiscover.xml file so it would be recreated when I started Outlook. I left windows explorer open while I opened Outlook.  It didn't ask for the password right away, but about 20 seconds in, it asked for the password and the new autodiscover.xml file got created at the exact same time.
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Seth SimmonsSr. Systems AdministratorCommented:
No comment has been added to this question in more than 21 days, so it is now classified as abandoned.

I have recommended this question be closed as follows:

Accept: Sean Rhudy (https:#a42436810)

If you feel this question should be closed differently, post an objection and the moderators will review all objections and close it as they feel fit. If no one objects, this question will be closed automatically the way described above.

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