Outlook: Permanent prompts to re-enter passwords

temuco  We had a similar problem where Outlook would keep popping up and asking for the user's password. I'm not sure if that's the same issue as you are describing. But we were able to fix it with the following registry changes:

reg add HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\AutoDiscover /t REG_DWORD /v ExcludeExplicitO365Endpoint /d 1

reg add HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity /v DisableADALatopWAMOverride /t reg_dword /d 1 /f

If the above didn't fix it then we would do a full repair of Office and that would resolve it.