@AshC I know, I have been working with your software for a very long time. I am very familiar with Apple computers as well as permissions to authorized. BUT if the technician's computer is in BigSur, he cannot take control of a remote computer. Even with the permissions, permissions checked etc.
It's very annoying
I could not install the beta link either so I called support. What did the trick was clicking the screen recording option for LogMeIn in Security and confidentiality. The technicien also click the microphone for LogMeIn apps.
Hopes this helps!
A few basics:
Essentially, once the LMI.app is downloaded and the client attempts to launch it, nothing happens. You get the launch animation and that's it. I've checked in the System Monitor (?) and don't see LMI hiding in the background. I've tried enabling/disabling the OS' firewall as well as adding the applet to the white list. I've tried pre-adding LMI to the appropriate permissions. My instincts point me to the fact that the random PIN prevents LMI from being used from the App store, but that wasn't an issue with Beta nor 11.0.1.