Hi Michael Gunter has your Apple TV been recently updated (software update)? It looks like their latest software update introduced a bug on Youtube App. Could you please try to unplug and replug your Apple TV and let us know if that helps?
If not, I would recommend adding your Apple TV as an IR device (category Set-Top boxes & media streamers, brand Apple, Model AppleTV4 for example) to avoid this issue.
We have contacted Apple on this and are waiting for their answer for when they will be able to fix this issue since it is on their side.
I did try unplugging the Apple TV and then plugging it back in. Nothing changed. The only app that is affected (that I’ve used) is the YouTube app. My Harmony remote and the original Apple TV remote work, it’s just the Sevenhugs remote that’s doesn’t work in the YouTube app alone.
Michael Gunter thanks for sharing your feedback. The Smart Remote is seen by the Apple TV as a keyboard and this is a bug on Apple TV's side for all 3rd party devices seen as keyboards by the Apple TV. We are waiting for Apple to get back to us on this, we'll make sure to let you know as soon as we have news. In the meantime, I would recommend adding your Apple TV as an infrared device on Smart Remote.
Thanks Michael After I had posted my comment I discovered the remote didn’t support Siri. I use it extensively on my Apple TV remote. I’m surprised because I was under the impression it did. Hopefully they upgrade it to include that feature.