@odaselementales your information is out of date. YouTube TV is again available on Roku devices. That happened last week.
As to your Peloton, you need to be more specific. I see a Peloton channel in the Roku channel store, but since I don't own such a device I don't know how it works. You mention something about casting. If it works the same as casting using Apple AirPlay or Windows Screen Mirroring, there's some network requirements that must be met for it to work. If it worked before but now does not, it's possible that something changed on your network. For example, I discovered yesterday that a recent Windows update had turned my computer firewall back on from my previous setting. An update to your home router might have changed a security setting that allows/blocks access.
If the network settings are all correct but the app isn't connecting to your Peloton, then the problem isn't something Roku can help with. They have zero input on 3rd party apps, and only the app provider (in this case Peloton) can resolve any issues.
Dan
Roku Community Streaming Expert
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