This is with a Sennheiser PXC 550 headset.
In Windows, the headset is selected in the sounds settings and shows as "Headphones (PXC 550 Stereo)".
When joining a appear.in room, I'm asked to select an audio input device.
"Headphones (PXC 550 Hands-Free)" so I select this.
Once joining it will get stuck on "loading cameras...".
I then changed the default device to "Headphones (PXC 550 Hands-Free)" in the system settings, and attempted to join appear.in room again, still choosing "Headphones (PXC 550 Hands-Free)" as input.
Same deal, stuck "loading cameras...".
If I choose another input than "loading cameras...", then I can join the room.
I can join the room with Chrome easily.
This is a regression, it used to work.
Will test with a different BT headphone.