Problems with NVIDIA L4 on windows server 2022

Hi ! I have the Nvidia L4 GPU on a physical server ( motherboard HPE ProLiant DL380 Gen11 ) with windows server 2022 as an os. My server does not have any access to internet.
I installed drivers that i downloaded on nvidia for the L4 on windows server 2022 Cuda 12.8.
My GPU appears fine on the bios, it appears fine on device manager.
The issue is that whatever i try to do, it isn’t used. I cannot see the gpu in task manager. If i do a dxdiag it tell me that this is the Microsoft base diplay adapter that is used. If i go into Graphique parameters and try to “force” one of my application to use the L4, it isn’t even on the choices list.

Does someone have any idea?

Thank you