How do I fix a Repeated Password Prompt in Outlook?

 

If the above window always appeared,

• Check the Password or Username is correct or not,
• If you are using the App Password and you enter the normal login password this will be always prompt until you enter the correct App Password.
• Password is expired or not,
• login account is disabled or expired.

The above all checked and still you appeared the above window, there might be Credential Manager issue in windows. To avoid that please follow the below instructions.

• Go to Control Panel

• Select Credential Manager

• Select Windows Credentials.
• Select outlook.office365.com.
• Select Remove.

• Click OK and restart the computer.
• After restart the computer, open the Outlook and give the password.

Please note that, don't do this while open the outlook and make sure to close all the Outlook windows before remove the credentials.