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

Hey!
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