Microsoft says multiple Windows 10 apps including Outlook are affected by an issue causing them to forget users’ passwords after upgrading to certain Windows 10, version 2004 builds. The cause of this issue was discovered by Google vulnerability researcher Tavis Ormandy two months ago. A workaround for this issue requires affected users to delete scheduled tasks created using Task Scheduler’s S4U (Services For User) option. The workaround procedure requires you to open the Quick Link menu by right-clicking the Start Button and selecting Windows PowerShell (Admin)
Source: https://www.bleepingcomputer.com/news/microsoft/microsoft-working-on-fix-for-windows-apps-forgetting-passwords/