The short explanation
Modern consoles read the capability data at startup and build their video menu from it. Options that are not advertised do not appear — grayed out at best, absent at worst.
Where you run into it
People conclude their television or console does not support a feature when in fact the capability never arrived. The usual culprits are an AV receiver in between, a soundbar in the video path, a television port that supports the mode on only some inputs, or a cable that cannot sustain the FRL rate.
Consoles also cache what they learned. After changing anything in the chain, a hot plug or a restart is often needed before the new capability set is picked up.
How the DR HDMI 8K handles it
Put a DR HDMI 8K between the console and the rest of the chain and you decide what the console is told. Twelve 4K120 EDID tables with different chroma, VRR, HDR and audio combinations mean you can present exactly the capability set you want, then use ISSUE HOTPLUG to make the console re-read it without unplugging anything.
Want to test your own HDMI chain?
The DR HDMI 8K is sold through the HDFury.eu web shop.