Meraki MX67C Firmware
Have you checked with the ISP if they can see the ONT as being online?
Yes, they can't see it, also tried at workshop, different WAN circuit, same issue, I can get my test unit to connect but not the customers one
If the ONT isn't working then you need to deal with the ISP it's not an issue with the MX.
The ONT is working fine
Is your network adapter updated or working properly?
I have heard of someone else having a very similar issue with the MX67C.
Was there a firmware update (check the Meraki dashboard)? If so, I would roll back that update.
You can also check the Meraki dashboard change log to see if anyone changed anything after Christmas until the issue was discovered.
Meraki Support have deemed the unit fauly and have sent a replacement. all working good now, thanks all.