can't get speed sensor to connect

I have a brand new edge 540.  The also brand new (came in the kit) speed sensor will not pair.  I tried a new battery but still no luck.  My kit also came with heart rate and cadence sensors that connect without issue.  I have the speed sensor installed on the hub of the bike, when I spin the wheel, it will sometimes blink a green light.  Is there something I can try?  Did I get a bad sensor and need to ask for a new one?

thanks!!