Thanks for trying. I’m unfortunately out of ideas.

Try 144 or 165 if you have it. It’s some sort of matching game rather than hardware compatibility.

What is your resolution and refresh rate set to? MacOS can be quite picky.

Do you have transcoding turned off? Sometimes it wants to play in “maximum quality” or something which is actually transcoding.

Are both your devices using Ethernet or WiFi?

!Two birds with one stone!<