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.
It sounds like Sky have gone for a period of exclusivity. We've got Discovery and some other channels via NowTV but we want Discovery+ for the back catalogue and exclusives programming and also MotorTrend content. It gets on my nerves when sky does this but it's even more annoying that Discovery appear to be lying about it.
I’ve found a way of watching it on Roku. I’ve downloaded a casting app (it’s a blue coloured app called TV cast R) on my phone that links to my Roku stick then casting the discovery+ webpage through that.
this doesn’t work on my more modern Roku box. But work on an older stick
You can use airplay to cast it to a compatible roku device. I know the streaming stick plus and roku ultra have AirPlay. That’s how I’m currently doing it and it works fantastic (not as good as a dedicated app) but oh well.