windows security mail application not accepting username and password


Outlook version
Outlook 2010 32 bit
Email Account
Exchange Server
Trying to setup office 365 account via outlook. I've successfully added my office 365 settings to several computers, but on one computer, during the second setp of autodiscover (search for settings), the windows security dialog appears, entitled mail application, and prompts for my username and password. This happens on all the machines I added this account to, but on one particular computer, I adding the username and password doesn't work. Once I press "Ok", the dialog reappears and prompts again, and again, and again.

I've tried removing credentials from the credential manager, I've tried deleting all mail profiles and starting fresh, I've even started fresh with a new windows profile. I also uninstalled office 2010, restarted, and then reinstalled office 2010. None of this has worked to get beyond this windows security prompt.

Any suggestions?