Left is when 2nd screen is disabled, Right is when 2nd screen enabled. Amazon Prime detects connected screen and turns off HD.
I switched from Chrome to Safari and it fixed it. Apparently it’s a software issue, not a purposeful HDCP restriction.
If you have found this post useful, please consider supporting my work with a donation on buymeacoffee.com/99rabbits. Half of the proceeds go to the Foundation "Come Back Alive", supporting Ukrainians.