Hi,
As far as I know, the problem that Outlook keeps prompting for password could be caused by various reasons. Before going further, could you please provide the followings information then we can help you better?
What's the version of your Outlook?
In which specific step did you encounter the issue?
Besides, please refer to the relevant thread below and check if the possible solutions there can be helpful in your scenario:
https://social.technet.microsoft.com/Forums/office/en-US/170d9d4e-cf2c-4cbd-832b-b1bc91efdf37/outlook-2016-add-account-wizard-windows-security-prompt?forum=Office2016setupdeploy
Any update, please feel free to post back.
Best regards,
Yuki Sun
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