log on to Tableau Online website
opened Tableau Desktop (retail),
Enter registration information.
click on Activate Tableau at the top.
click on "Activate by signing in on a server".
clicked on Tableau Cloud.
Enter login credentials on Tableau Cloud screen.
Complete MFA again.
Enter info into Registration screen again.
At this point, Tableau Desktop should be registered and Tableau Desktop open.
Enter DataSelf’s Tableau Server URL into Server url
Close Tableau Desktop and reopened it, to make sure it will open without issues.