- Hit the Windows Key on your keyboard.
- Type credential manager and open up the Credential Manager application that shows up from your search.
- Select Windows Credentials.
- Remove all credentials relating to Microsoft. To delete an item, click on the downward pointing arrow to the right of each item and then click Remove.
- Items to remove:
- MicrosoftOffice16_Data: .... (delete all these items)
- outlook.office365.com
- SSO_POP_Device
Reopen Microsoft Outlook. You may have to reenter credentials.