Sorry but virtually all universal remotes control over direct line of sight infrared (IR) signals. Roku stick models are normally used out of sight behind a TV where IR signals can't reach so they don't use IR at all and are only controlled by Wi-Fi direct signals that can pass through obstructions like tvs and walls.
If you've lost your original remote or it's no longer working and you need a replacement, get a Roku Voice Remote. It can be found at Walmart, Target, Amazon, etc for about $20. It controls Roku Sticks via Wi-Fi Direct, and also has buttons to provide limited tv controls (power toggle, volume up/down, mute toggle) for most tvs via IR.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X
