I can no longer connect to my LG T V and mirror my S21 ultra in the beta. I can only see my neighbors Samsung TV in the upstairs apartment. Tags work, after the short update provided as do my new buds pro 2.
I had the same issue. Turn off phone and unplug devices attempting to connect to. Power on the devices to connect to first. Power on phone. Make sure they're on the same WiFi network. Poof. It worked for me.