I'm having major issues with the Mail app I have 10 linked accounts - a mixture of Hotmail, outlook, and mostly Office 365 Exchange accounts (Im a Contractor working at several sites) Frequently several of all of the accounts remove their stored password and cease working however.. varying between multiple times in a single day, to up to every other day etc Dozens of others I work with are also experiencing the same issues.. I use a iPhone 11Pro , but the issue is also evident on other models of iPhones after upgrading to iOS 14.1