It could just be a simple setting, but there might be something that requires a little more troubleshooting happening ...

If YouTube isn't working on your Roku device, there are a handful of troubleshooting tips you can try.

Check the audio settings of the Roku. If it's not hooked up to a system capable of playing. 5.1, it needs to be set to stereo. What you mean by "downloaded" can make a difference too. It's set for 5.1 ...

Whether it’s your remote or a buggy app, these fixes have you covered This article explains how to fix problems with Apple TV Plus not working on Roku. When experiencing problems with services on Roku ...