MS Outlook is a popular email client that has so many active users around the globe. It works smoothly, however, sometimes due to the following reasons, Outlook keeps asking for password even though it is correct. 

• Outlook profile is corrupt.
• Due to the bad network connectivity.
• Sometimes the antivirus programs caused this error. 
• Incorrect password stored by the credential manager. 

In this regard, I have found this informative article that explains the 3 different manual methods that will help you to eliminate this issue.

Get more info: https://www.mailconvertertools.com/blog/outlook-keeps-asking-password/