Change the user permissions so the user is an administrator of their own computer.
This is about the issue with the Register button greyed due to the lack of administrator permission. If you have the permission, you should be able to register it. If the registration screen pops up every time after successful registration, it is a different issue.
Check if Tableau Desktop is installed and running in a persistent environment. If the roaming profile is not used, the registry information may not be saved properly and this issue may occur.
Tableau Desktop and Non-Persistent Virtual Machines
Understanding nonpersistent vs. persistent VDI
Mandatory User Profiles
Roaming User Profiles
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