KD55XF900 help please

[DaddyDeeS]

Hi, I just bought a Sony KD55XF9005BU TV.

When I first used it I got Dolby Vision playing on the YouTube app. After messing with various settings and updating things. I no longer get Dolby Vision on YouTube. It works on Netflix and Disney+.

Please, any help?

[rooobb]

There wasn't ever Dolby vision on youtube...