Hey @Dan_Brumm
I seemingly have missed that information, as my Notebook server is installed on Windows Server 2019 and is operating without much issue at this point. I'd say you'd be safe installing on 2019!
Edit: Also re-reading, when it mentions Windows containers, the VMs that the Notebooks run on seem to only be able to use Windows containers on 2022, with 2019 only being able to use Linux containers, I use Linux through Docker Desktop to use our Notebooks.
Cody