Pairing XR15v2-UQ REMOTE TO BOSE SOUND BAR.

How do I pair a XR15v2-UQ REMOTE TO BOSE SOUND BAR.  I have tried following everything on the set up with Xfinity. I have tried everything I found on the Internet. It seems when I try to enter the code. It just won’t enter. I got it done one time, but it didn’t pair.