This happened to me too! It's absolutely insane that a license I bought through my account can't be transferred somehow...
My newest NUC is somehow recognized by Windows 11 as being entitled to a copy, and I can reinstall on it repeatedly while keeping the activation, so at least we've got that going for us.
But after Proton, all the machines in my house exclusively run Linux. I sincerely hope I never touch a windows machine again for the rest of my life :)