Help with Shader model 6.7+ support on RTX 3090

....I can't post any code here.

Has someone run into the issue where an RTX 3090 will not support a Shader model above 6.6 but Nvidia says that it should even beyond 6.8 which is the latest in process Shader model?

BACKGROUND:

Nvidia customer service says that Shader model 6.8+ is supported. Microsoft blogs do as well for ampere. I have the latest STABLE Agility SDK, latest GDK-public, latest game ready driver and I have also tried studio drivers. Latest stable DXC. All via NUGET.

When I set "device dependent resources" in my "main" CPP file for the DX12_2 project to Shader model 6.7 or higher I receive an error that Shader model 6.7 or 6.8 is not supported. Then I get memory exception errors that I don't get on 6.6.

I remember at one point in time Microsoft wanted you to enable developer mode in Windows to support a preview version of the agility SDK that included Shader model 6.8 features. So I don't know if that also goes for 6.7. I would much rather not operate in developer mode for a Simple Shader model target.

....I can't post any code here.