GE Zigbee plug-in dimmer won’t pair?

Having paired well over my fair share of zigbee devices on my hubitat production (> 50 zigbee devices) and isolated development hubs, if it doesn’t get to the initial pairing (where it shows the 64 bit address) within 30 seconds, don’t bother continuing. For me “don’t bother” in production is always insufficient repeater coverage.
As I’ve mentioned several times in various threads, your best bet is to pair in place, if it won’t pair in place, the device certainly isn’t going to work in place for very long, if at all.

The 30 second rule obviously applies to devices that we know have paired to hubitat before.