Problem with Bluetooth volume control from TV set top box and wireless Apple AirPods Pro earphones.

I have successfully established a Bluetooth connection between  my wireless Apple AirPods Pro and my Xfinity TV set top box.

I also discovered that, currently, there seems to be no way to control the volume to the earphones with this setup!

It seems the sound emitted by the Xfinity set top box via Bluetooth is at FIXED VOLUME. While the volume control for the AirPods is via the iPhone only. The iPhone is not in this “loop” so the AirPods’ volume is extremely loud and cannot be adjusted!

The Apple AirPods are extremely popular with many millions being sold. Is Xfinity-Comcast aware of this problem and is a fix possible or being worked on?