I thought I'd share my experience in case it helps others.
After setting up my new xg1v4 I was disappointed that Ultra HD was not showing up as an option in Netflix. Whereas my TV's built-in Netflix app properly showed Ultra HD. I could also play 4k content on YouTube.
It turns out that my Samsung UN65HU8550 (circa 2014) only has a single HDMI port that supports HDCP 2.2. That TV only supports HDCP 2.2 on HDMI-3, which is labeled the MHL port. I had been using HDMI-1 (as recommended by the Samsung install guide).
Once I switched to HDMI-3 (with hdcp 2.2 support) I rebooted the xg1v4 but it still didn't work! I still only saw HD options. Then I rebooted the xg1v4 once again, re-opened the Netflix app, and it worked! Why didn't it work after the first reboot? I don't know but at least it's working.
BTW, I'm using "high-speed HDMI" cables from ~2015. I did not have to upgrade to newer cables.
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