If the advice from @Deedee36 doesn't resolve the issue try the following to see if the issue is with your remote:
Check the batteries
An easy way to check is to cover the buttons slightly on your Sky remote with your hand. You should see a white backlight behind the buttons. If you don't see the backlight the issue is the power with the remote, so potentially a battery issue.
Check the battery compartment to make sure the paper used to protect the battery has been fully removed. It might have ripped when being removed leaving some behind.
Still can't see the backlight? It’s likely you need to replace the two AAA batteries.
Pair the remote
Press 7 and 9 together on your Sky remote for three seconds (This resets/clears the remote)
Press 1 and 3 together for three seconds (bluetooth mode) and follow any on-screen instructions.
The next option sounds insane but a number of users have reported it resolving the issue with their remotes. You could try holding the remote at both ends and giving it a gentle twist as though you were wringing out a towel. It
If it is still not working have a look at the following guides:
https://www.sky.com/help/articles/remote-control-help-sky-glass
https://www.sky.com/help/home/sky-tv/sky-tv-glass/fixing-a-problem-sky-glass/fixing-sky-glass-remote...
If none of these options work you can request a replacement remote via this link: https://www.sky.com/help/forms/streaming-tv-remote
If you have an old Sky Q remote, you can use that as an interim solution whilst you await the new remote.
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