As part of trying to understand more about the actual issue, does anyone know
1. Why the PS5 works and XSX does not? Is it that the PS5 has made the same mistake/interpretation on something in the HDMI specs as the AVR chips? Closest thing to an explanation I can find is here
PS5 HDMI 2.1 Bandwidth Is Limited to 32GB/s, Unlike Xbox Series X's 40GB/s
2. What's the situation with the latest PC graphics cards - do they work?
I guess that the fact Denon is shipping the free dongle box means that it's the AVR that's getting something wrong, although they've been careful to word it in such a way that they don't actually say that. If the XSX was the issue they would more than likely just point the finger over there.