Mail app
Uh I haven’t used the mail app in a while but it signed me out and it’s not letting me back in, how do I do it with my Apple ID? (Don’t want to add a new account on the phone)
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Device or computer?
IOS
Have you tried deleting the account, restarting the device, and then adding the account back?
OS
What does Mail/Window/Connection Doctor Show? If the server is red, select it and look at the Show Details box.