As stated previously in this thread, for more information about that channel's functionality and error messages, you'll want to contact NBC support directly to inquire further. Many channels on Roku are developed and maintained by the channel provider themselves.
Channels on Roku are maintained by the channel developer themselves. We suggest reaching out to NBC Support directly to report the issue and for further help. There's likely an issue within that specific channel that needs to be addressed with an update from the channel developer.
If you tried to remove the channel and adding it back after you've restarted the device does not resolve the channel issue, I'd recommend reaching out to the channel support directly to report the issue and request additional support. Many channels on the Roku platform are developed and maintained by the channel provider directly, and they'll be able to best assist. If other channels are working correctly, and you only experience this issue on that channel (app), that is likely an indication that the issue lies within that particular channel. In these cases, the channel provider will need to investigate the issue in order to help resolve it.
I've got this same problem. I've followed all the advice here about removing the app, unlinking, etc., and for some reason all the other channels work as does the live streaming, but not the Oxygen channel. Interestingly enough...if I log into the Oxygen App on my Android, it works fine. I'm about to ditch sling and see if Hulu Live is better because it should not be this complicated to watch one network.
We do apologize for the inconvenience this has caused you.
Just to confirm, did you restart your Roku device before re-installing the channel? That step is crucial when performing the troubleshooting. If you haven't tried the suggested order, we would recommend giving it a shot once again.
You need to unlink the app and then link it again.. For instance, for issues with watching the Bravo app: in the app itself, navigate to More --> Profile --> Unlink. Once you have unlinked your TV provider, link it again