At the moment we still not completely sure W11 will enforce TPM 2 or if it will be possible to get around the limitation.
Not sure what will come with the official ISO and can't really test without it unfortunately.
So i'm sorry but i don't really have an answer on TPM2.
Oh I see. I may have read incorrectly. I honestly would not be able to tell you if that is the reason why you are having issues. I do know, however, that the 3.5GB of ram error is fairly common for people using Xen and wanting to pass-though a graphics card. If what you send is linked to that error, then it might be related.
Please take time to read the documentation. If you can't afford 220$/month to save your critical data (without even talking about having support for the virtualization platform itself), maybe it would worth at least your time to search on how to use all XO features for free.