Are all pucks bought for the same country/ region? Mixing US and EU for instance, won't work.
Guidance on set up:
If that does not work I'd try to factory reset your whole network and set it up from scratch:
If you use the same network name (SSID) and password, devices will reconnect by themselves.
I have had exactly the same issue this weekend and
worked it out today - If you connect to the WiFi the AP
generates and press the i beside the name, ensure that
the following is all switched off:
Private Wi-Fi Address
• Limit IP Tracking
I switched it off and they connected to the mesh after
that. Been hours trying to fix it!!!!!!