I have three Apple DTK Mac Mini machines with Mac OS Big Sur Beta installed. I get the notification that there's an update to the OS, but when I've downloaded the update I get into an endless loop of being asked for my admin password and no update is ever installed.
I've tried using the macOSDeveloperBetaAccessUtility, which seems to get me further and actually opens the OS installer, but after I click agree to the terms and continue, I'm asked for my admin password twice, once for the helper, once for the install, and I'm dropped right back to the continue dialog again. If I click continue again, I'm asked for the password twice more before being left at the very same dialog.
I guess Big Sur beta is a long way from being released if they can't get any feedback from developers.
Anyone have any ideas?