Namron LED Dimmer Z-Wave 200W (w/dimmer wheel) sync

I have sync’d with 8 of them, but 2 of the dimmers wont sync. I had another one it the same are which didnt work. I loved the Smarthub closer to them, and only the last one would sync.
Any tips?
New house, smarthub classic from futurehome

Since some are working, but not all of them, I would recommend you to call support.
It’s hard to see any pattern here. Phone: 23506847