Have an Xbox Series X, HD621 and I bought Greg Wright's VRROOM!!!

I have VRROOM connected to EARC HDMI port of OLED and audio/blank video HDMI output of VRROOM connected to HD621.

I had Xbox Series X outputting uncompressed 5.1. 120hz HDR connected to OLED. The VRROOM pulls the sound from TV and sends it to HD621 as do other devices connected to OLED and VRROOM.

This works very well.

The UHD722 should process the output from VRROOM the same as HD621.