This is a stick? You need a Roku remote that connects via wifi-direct since the stick is meant to be used behind the tv where a line of sight IR remote can't reach it. This means a dedicated remote from Roku, not an IR universal remote.
One more potential fly in the ointment -- what model stick do you have? If it's one of the old ones in a purple case, Roku no longer has remotes available for it.
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Roku Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Roku Streaming Stick 3600
Our physical remote lost pairing over a year ago. We have been using apps on our phones with no problems. Today we switch routers in the house and WiFi changed so we cannot connect our phones to the roku stick. So no remote and no app works. We have tried all the pairing options with original remote for some time now. That will not work. How can we connect our apps to the roku device when it is on a different network?