See if that video helps.
I just got my 9310 dev edition, I was able to configure the fingerprint authentication right away, it was already in the factory Ubuntu OS, but I cannot find a way to use the IR camera for Facial authentication. I know about Howdy but thought maybe there is something already configured in the system? Thanks
XPS 9310 (2021) with Ubuntu 20.04 (Dev Edition) use of the IR camera