Using the steps above, I'm able to install a fresh copy of Big Sur using Parallels 15. However I'm not able to login with the user that I created. I get the same login issue if I upgrade a vm from Catalina as well. I enter my password, login, the system spins for a little while, the screen goes black and then it is back to the login prompt. If I enter a bad password it tells me. This only happens with a good password. Is anyone else able to get past the login prompt?