Hello Neil,
Not a silly question at all.
The latest release of PLUS+1 is recommended to be used with windows 10 according to the release notes. And I believe this will also be the case with the upcoming 2022 release.
With that said, many people (customers and Danfoss PLUS+1 developers) have made the switch to Windows 11 without any issues. But I can not answer to why the "Official Windows 11" stamp is not put on there.
I hope it helps.
