A fix to better retain login credentials is targeted for the Spring 2021 features release & is currently being beta tested.  This impacts a small group of WIN10 users currently.

Microsoft is finally fixing this annoying Windows 10 bug – MSPoweruser

The reports of Windows 10 failing to remember login credentials for apps like OneDrive, Outlook, Microsoft Edge, Microsoft account, Google account, Chrome, Adobe CC, etc, first surfaced in the month of April.  The company has finally found to way to permanently solve it. The fix is currently rolling out to Windows Insiders and should be available for the general public in the next optional update.  This Windows 10 bug caused an issue where the software failed to remember the username and password.  The issue has affected only a small number of users. “This issue in Windows affects only a comparatively small number of users with S4U task and it’s now fixed in the latest Windows 10 insider channel,” wrote Eric Lawrence, Microsoft Edge Program Manager.