Separate names with a comma.
OK, so now I have to run the above Parallels CLI command every time before I run Parallels Desktop. Otherwise, the loop dialog situation reoccurs. :(
Interestingly, I also have VirtualBox installed but did not uninstall it.
I had the same problem with Big Sur Beta 4 and Parallels 16. I tried all the suggestions except reinstalling MacOS and installing Parallels from...