After spending hours waiting to get the VM of Big Sur beta going the VM it logs in with the user that is created at macOS set up and then immediately logs me off!! What a bunch of crap. Anyone else have the same problem?
Right now Parallels 16 doesn't support upgrading from macOS 10.15.6 to Big Sur of any version. I tried the process after seeing the market nonsense Parallels 16 Big Sur is now supported only to learn it wasn't in going from Catalina 10.15.6. So I just imported the VM image into fusion and had no issue booting the upgraded image.