To update on this: I went back and tried every version of the companion app in TestFlight with both RCP3 Beta 3 and 4 and was unable to get any of them to work/connect.

I am running into this as well on my MBP and Studio, both running 27 beta 4 and RC3 beta 4, headset is also beta 4 with latest app from TestFlight. The VisionOS app also becomes unresponsive after the connection fails and has to be force closed.

Ignore options don’t work, settings crashes when trying to open screen time options, system is completely broken. This needs to be fixed asap