Try these steps to fix: Use at your own risk.
Method 1:
Close Outlook down. Then open Word and and select a blank document. Then click File > Account > Sign Out. Close Word down. Now open Outlook and you should get the Username and Password prompts.
Method 2:
Add a DWORD called DisableADALatopWAMOverride with a value of 1 to the registry in the path below:
HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Common\Identity\
Once done, reboot your PC. When your PC has rebooted open Outlook and all should be good with the world. If it didn’t work, ensure you remove the registry entry you created earlier and reboot again.
Method 3:
Ensure Outlook and any other Office applications are closed.
In Windows 10 open settings by using Windows + I keys simultaneously and the Settings screen will open. Click System > Shared Experiences. If the Accounts section shows an error with the credentials, input the correct credentials. Once you’ve applied the correct credentials, open Outlook and things should be back to normal.
Kon Belieu
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