Outlook is attempting to authenticate to the Exchange server using local username and password

HI YOUN ANN
Thank you very much for your reply. I tried to look for the credentials in the credential manager, but I couldn't find any relevant credentials. It's possible that these credentials are not visible in the control panel.

I found that Outlook automatically uses the current Windows system login user credentials to authenticate with the Exchange server. For example, on my computer without a domain, the local user is Administrator. This results in corresponding authentication records for Administrator on the Exchange server, and multiple failed attempts can lead to the Administrator user account on the domain server being locked.

This method of using the Windows system user credentials for authentication is more suitable for domain-joined computers, but it can be problematic for non-domain computers when it comes to the Exchange system.

I'm wondering if there is a way to make Outlook only use its own email account credentials for authentication, instead of using the Windows system user credentials.

These are just my guesses and thoughts, and they may not be correct. I would like to understand the specific reasons and solutions. I welcome further discussion. Thank you.