Remote Control Issues

I installed a Samsung NU70000 yesterday upstairs.  There is another Samsung on the first floor.  Tried pairing the xfinity remote to the child box upstairs but found that the pairing info shows up on the downstairs TV. When I try to pull up the guide, it pulls up the guide on the downstairs TV.  I seems that I cannot pair to or control the TV via the child box.

I'm using a XR15 remote upstairs.  The XR15 works fine on the downstairs TV.

Any ideas?  Do I need to purchase a universal remote that is not an xfinity product?