Thank you for your response.
We have verified the SIM works with a Vodafone provided LTE Hwauai modem, and we have a strong signal.
We've booted the MG into safe mode so it could check into the Meraki Cloud, and download the latest Firmware.
The local status page is reporting continual searching for a signal. Making me believe as you said, it's an issue with the config (APN settings)
Unfortunately, we've contacted Vodafone IE several times with no luck. They claim there are no specific APN settings we need to set. Everything is handled by the SIM and on their end.
I'm hoping there may be someone here who has deployed an MG in Ireland with Vodafone and can either confirm or deny this.