Repeated prompts.
WHAT IT MEANS
Authentication is failing repeatedly.
WHAT TO CHECK
That the password works in webmail That the username is the full email address That the stored password is current
THE FULL ADDRESS POINT
The username is the complete email address, not just the part before the at sign.
The most common cause.
THE OUT-OF-DATE PASSWORD
If the mailbox password was changed, every device needs updating.
A device still using the old one prompts repeatedly.
THE BLOCKING CONSEQUENCE
Repeated failures from one address can block it temporarily.
That affects your other devices on the same connection.
WHAT TO CHECK
Whether the prompt is for incoming or outgoing.
They are configured separately and both need updating.
WHAT ELSE TO CHECK
A saved credential in your device's keychain Another device with the old password still configured
WHAT TO TRY
Remove the account and add it again with correct settings.