Just a good general heads up: some TVs or pass through devices only support ONE HDMI hdcp 2.2 port. You may have to look at your manual or trial and error.
Try 4k 30hz
if you are not connected directly to your tv and are going through a switch box or Home Theater receiver, set the mi box resolution to 4k 30hz
What netflix account type do you have? You have to have the most expensive one (I believe it's 4 screens) in order to watch Netflix in 4K
I'm beginning to hate mobile reddit apps.
Is your TV hdcp 2.2 compliant?