Cannot launch game from steam. "missing feature: shader model 6 & directx12 compatibility"

Halo Support has failed me 3 times and I desperately want to play. I’ve submitted a ticket after each flight and now again, with the only response being “We have nothing for you to try”. This issue is affecting multiple people and we feel left behind after all these months of wanting to play the game.

Message: “Could not find compatible Graphics Device due to the following missing feature: Shader Model 6… Please ensure you have a DirectX 12 compatible graphics adapter and have installed the latest drivers provided by the manufacturer.”

Specs:
Nvidia RTX 2070 Super and an i7 4770k processor, 12GB ram, updated Nvidia drivers, updated windows 10, Dxdiag confirms DirectX 12 compatibility

I should not have an issue playing with my computer specifications.