I currently use my M5 primarily as a computer speaker - connected with the optical input.
I've noticed, however, that while the optical cable is plugged in, I am not able to use the Google Cast feature. I've attempted a variety of methods using the device itself (to change inputs) and the B&O app, as well as resetting the device, etc.
The only way I can get Google Cast to work is if the cable is unplugged.
Does anyone have any advice, or experienced the same issue?