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The HDMI Forum rejected AMD's open source HDMI 2.1 implementation
(www.gamingonlinux.com)
This is a most excellent place for technology news and articles.
are you unable to use display port?
The OLED TV probably only has HDMI. TVs don’t normally have DisplayPort
There are DisplayPort to HDMI adapters. Like this one:
https://www.amazon.com/dp/B08XFSLWQF
None of the adapters seem to support VRR though, for whatever reason.
Same reason probably: the HDMI forum