In Color mode, YCBCR 4:4:4 I get Dynamic Range Conversion. but in 4:2:2 I get HDR Perfectly.

Hi, So when I put my Panasonic DP-UB820 4K Blu-ray Player in Color mode YCBCR 4:2:2, I get HDR High Dynamic Range perfectly.
But if I put my Panasonic DP-UB820 4K Blu-ray player in Color mode YCBCR 4:4:4, I don't get HDR. I get what's called Dynamic Range Conversion. I know it's not my brand new Samsung QN90C TV that is the issue. but it could be either my RuiPro 8K HDMI2.1 cables that is the issue or it could be my 2016 Onkyo TX-RZ-1100 Reciever, which is the issue. but my Onkyo TX-RZ-1100 Reciever does support all the color spaces, but then again, I have read on Fourms that it could be my Onkyo TX-RZ-1100 Reciever that is the issue. my Onkyo TX-RZ-1100 Reciever does Support Dolby Vision and HDR10 as well as HLG, and it supports Dolby Atmos and DTS-X

[@MarkTallen]

Try setting the player setting to 10 bit priority 4.4.4