Help & troubleshooting for channels on your Roku device, including adding/removing channels, logging in to, authenticating, or activating a channel, channel-specific playback issues, assistance contacting channel publishers to report issues, and adjusting channel-specific settings.
Is Disney+ not playing in 4k on my 4k tv because it doesn't have HDR?
I have Roku ultra and a Sony Bravia 4k 60hz that came out a year before HDR. I cannot get 4k to play on Disney+. Vudu Prime Apple and Netflix no problem. I tried forcing the different 4k HDR 30hz and 60hz as was suggested but still doesn't work. So disappointing considering I already paid for a year of Disney+.
For more information about that channel's features and functionality, you'll want to contact Disney+ support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.