Can't pair GE light switch

What model number of GE switches are you trying to use?
I have seen some people post that some models do not work well
I had to determine what zigbee channel worked best
one of my GE 45856 zigbee switches would not see it on channel 21 but changed the zigbee channel to 20 and it paired fine.
I really like my GE 26931 motion sensor zwave switches though.