Enhanced Remote issues with pairing

I've already spent considerable time in Chat with Roku tech support on this one. My remote will power on my TV and the Roku programming options screen loads just fine. However, I am unable to select any programs. The remote does not scroll in order to select a program option, such as YouTube TV as an example. The remote green pairing light comes on and just flashes but does not seem to want to pair properly so I can get full use of the remote.  Today, I rec'd a replacement remote from Roku. Tried to pair it as instructed. Got the same result as my problem -- the remote turns on the TV but it won't let me select any programs. Given this test of a new remote didn't solve the problem, I would guess that it is a stick problem maybe and not the remote. How do I figure this out? For some odd reason the remote(s) have stopped working fully. I am able to use the Roku app on my phone to select programming just fine, FYI. Looking for solution advice so I can go back to using my remote and not my iphone. Any words of wisdom would be great!  THX!