I’m sharing with you that I now have everything working with the purchased licenses. This was by no means a simple task to get all of this up and working.
First of all, the links to the Microsoft site to purchase a 5 pack license for 2016 server are no longer available, and they only sell for MS Server 2019. I purchased this for $779.00 and then proceeded to bounce around the planet from one department to the next trying to activate my new licenses.
Also following your instructions that the licenses only work backwards i.e, 2019 will work for 2016 but not 2016 for 2019, this is not true.
I have had to purchase the license through a 3rd party reseller and had to be sure that it was not OEM as it would not work in this instance of what we were doing.
Below are some resources I used to finally get all of this to work and configured:
I purchased the 2016 CALS from here: https://www.getlicense.today/products/windows-server-2016-remote-desktop-services?variant=12445515808865&gclid=EAIaIQobChMIgPGKhLml3wIVdR-tBh1iFQvyEAQYAiABEgI9EfD_BwE
I’m back up and running again