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After Windows doing an automatic update, anything with a Microsoft online authentication decided to stop working on my computer (Outlook - Exchange, Teams, Windows Store, OneDrive, Windows "Family", even SmartScreen.)

Yet browsing and everything else seems to work fine. I rely on Outlook and Teams a lot, so really need them to work.

I've tried a pile of things including reverting the Windows update, doing a network reset, system restore (failed), etc.

I setup another user profile, and it works fine there - so it's not a network issue. (That rules out a lot.)

However, there's a zillion customizations I have on my user profile; I'm really hoping there's something that I can just tweak vs. moving everything to a new profile.

A new user profile is practically as disruptive as a wipe/reload.

Somewhat similar to this issue: Users unable to reach any Microsoft services (Outlook, Teams, OneDrive, Windows 10 weather)

Anyone have any ideas?

Can't connect

Yes, I can ping login.microsoftonline.com Ping

Ramhound
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Ben in CA
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    I setup another user profile, and it works fine there - .... So at this point, replace the current User Profile. They cannot be repaired. – John Aug 28 '23 at 17:40
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    @John - Everything can be repair until it can't. – Ramhound Aug 28 '23 at 17:54
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    @BeninCA - Are you able to ping `login.microsoftonline.com.com` what DNS servers are you using? [Edit] your question instead of submitting a comment – Ramhound Aug 28 '23 at 17:54
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    It is almost always easier and faster to replace a User Profile than to find the needle in the haystack causing the problem. – John Aug 28 '23 at 18:04
  • For a regular user account, yes, just replace it. But for a power user, it's a last resort type of thing. – Ben in CA Aug 28 '23 at 18:52

2 Answers2

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Ended up just replacing the user profile.

Really odd issue though, and there's likely a much easier fix, I just don't know what it is.

Ben in CA
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In case the issue occurs again, you can try adding the registry keys below on the affected machine:

[HKEY_CURRENT_USER\SOFTWARE\Microsoft\Office\16.0\Common\Identity]

"EnableADAL"=dword:00000000

"DisableADALatopWAMOverride"=dword:00000001

"DisableAADWAM"=dword:00000001

Here's a similar thread for reference: FIX: Error connecting Outlook to M365 (HTTP 404 login.microsoftonline.com)

Yuki Sun
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