Thanks for the note. It sounds like the channel you are trying to use doesn't support this feature or functionality using those remote keys. You'll need to contact the specific channel provider directly to report the issue and request additional assistance. Each channel is built and maintained by the channel provider themselves, including features offered. They'll be able to best answer any questions you may have, or help with support needs.
The left and right arrows function of changing channels stopped working on all three of our remotes and using on my phone with the update that happened this week. Can't be all three remotes and phone issue, has to be a problem with the update.
@hertelshop Thanks for the note here. Individual channels determine some feature functionality within their own channel, such as the behavior that occurs when pressing arrow key buttons on your remote. Some channels that offer live TV channel guides update their channels from time to time, which may change this behavior. You will need to contact the specific channel provider directly to report the issue and share your feedback regarding their changes.