How to Add Roles like PowerUser, Viewer, etc. to a New User

Summary:

We have a new employee that needed to be setup as a preparer in ARC's. I went to Oracle Cloud, Default Domain, clicked the button to Create User. As I created the user there was not an option to add ARC's roles. I went to ARC's Access Control to try and add roles, but the new user does not appear as a user. I waited 24 hours and tried again with no success. Do you know where I can go to add an ARC's Role to a new User?

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