Hi Judd,
Not sure exactly what is going on here, but you should be aware of the following: -
A Blue iGRID LED indicates that your FX is connected to your cellular hotspot, but that the device providing the hotspot DOES NOT HAVE A CONNECTION TO THE PilotAware SERVERS. There could be several reasons for this, including lack of accessible cellular masts at the height or location where you are flying, that your data allowance has run out, or that there is some other complication preventing your 'Hotspot Device' communicating with our servers via your chosen mobile network.
It is also possible that recent updates in the iPadOS firmware of your Ipad Mini 6 might now preclude the iPad providing a hotspot via its 4/5G connection while simultaneously processing data received from Pilotaware via its internal WiFi. I deliberately don't use my Sim Equipped iPad Mini to provide the hotspot for my FX - preferring instead to take the hotspot from my Galaxy S23 phone, so I can't say if that is the case or not (and I can't test it for a while as I am due to go into hospital in a few days - sorry).
In addition IIRC, (though this might have changed since iGRID was first introduced), the system was designed to limit data use by automatically restricting iGRID where you already have a solid connection to one or more ATOM Stations and are already receiving all relevant data via the Ground Uplink from the ATOM(s).
While the presence of a GPS lock is essential for determining the position of your PilotAware - PilotAware will not for example transmit its own position and can't report the positions of other traffic if it doesn't know exactly where it is itself - I'm not aware of what effect a lack of GPS position would have on iGRID, though I can see that this might preclude uplink of data if the PilotAware effectively doesn't know where it is. But you say that you are getting a GPS lock - so this should be academic in your case.
i will, however, make some further enquiries and get back to you.
Best Regards
Peter