...
If using Chrome or Edge, then in addition, you may need to clear the cookies for login.microsoftonline.com and login.microsoftonline.us.
Open a new blank tab
Access the browser’s site data cache:
For Chrome, type: chrome://settings/siteData
For Edge, type: edge://settings/siteData
Search the cookies for login.microsoftonline
Click the trash can to delete all cookies/data for microsoftonline (i.e. Azure) (.com and .us)
...