It's the same problem I was facing trying to play Netflix Ultra HD on my AMD CPU. Fortunately Netflix now also works without Intel SGX so I can watch my stuff on my PCs now.
On the other hand: It is still not possible to play Amazon Prime Ultra HD on AMD CPUs and probably also on the new Intel 12th gen as of now.
The one thing I hate about these limitations is the amount of detailed knowledge that is required to know what is happening. As an average consumer I would have never thought of such bullshit. I only read about the problem wehn I had already bought my CPU...
If you torrent the content directly, it plays on all hardware and can be used offline or easily shared to friends via USB/AirDrop/etc. You also get a wide choice of players.
Everything good on the streaming sites is quickly available via torrent, and VPNs are like $5. Don't continue paying the media cartels for abuse.
WebTorrent + RarBg is where things are at now. Hopefully we will see more and more descentralized or anonymous search databases with Tor, Freenet, IPFS or similar technology to finally end the "Piracy Wars".
For a while I was running my second monitor over DVI. And putting Amazon prime on it cause the video to go blank.
I know why (I think there's some bs about not running HDCP over DVI even though it's basically HDMI in most Configs)
But it was bizzare to actually see it.
According to [1] Netflix supports "Safari up to 4K on macOS 11.0 or later"
Of course, you also need to be on the 'premium' plan, have a fast-enough internet connection, be watching 4K content, have the T2 security chip, have an HDCP display, and so on.
On Windows, you can, with a giant gotcha. Netflix need you to have all connect screen 4k to play ultra hd on Windows. I don't know if it is different if the screen is buildin.