Hey! I found this the other day when I had trouble with my Sony STRD-590 TCL TV I think mines a series 4 from 2017.
Anyway, after a week of messing around I got it to work today. It went from inactive to showing the STRD-590 as the receiver. You’ll need your remote. If you don’t have one you can get a 8 dollar one off amazon. That’s what I did and got it in today.
I went to amp settings on the receiver and found an HDMI section. From there I turned on HDMI Controller and bam! It connected in an instant. Hope this helps. Haven’t seen anyone mention this anywhere else that I looked.
