I've figured out the answer to this prior to posting, but wanted to help others since support's response was "Windows 11 is not supported." I upgraded to Windows 11 and the web products (which were using SSL) stopped working. It is a SSL issue rather than an issue with the products themselves. If you go to https://localhost, you should get the iis screen, but in the case you get the same SSL error.
Fix: Windows 10 certificates (at least self-signed ones) do not work with Windows 11. You need to create a new one, then go to SSL bindings and change it there, and go into the XMLEndpointConfiguration deleting the binding and configuring the new binding from the dropdown. At that point everything should work again.