Thank you Sergey. That is the only way it worked!
I had to create the script and download the exe file directly from there.
This time the computer automatically appeared on the Managed Remote Desktop Portal.

Thank you Sergey, that is exactly what I did and I still don't see any computers added to that section of the portal. Those individual links (computers, organizations, users) in that guide you sent don't work. They go to a 404 error.

Response below..