I did some tests, also using a similar driver of your (455.23.04 can’t find the 05 anywhere), and I can’t reproduce your issue.
It looks there is something that’s preventing you from using the GPUs. We got troubles recently with Nvidia Fabric Manager on DGX and HGX systems, but I don’t think your system has an NV-link switch, but maybe I’m wrong.
Which kind of hardware are you using? It’s an on-premise physical machine or it’s an AWS Instance (on an AWS Instance I could reproduce)
Also, the 999 could mean that the Nvidia driver is in a bad state, and a reboot (or a driver reset) is needed. Can you try to reboot the machine and re-try?