We have seen similar results with automatic carrier selection on the phone when roaming, where the home carrier does not have a reciprocal roaming agreement with certain local carriers, and the automatic selection has unfortunately chosen one that cannot provide a service. For me, it has normally been fixed by manually selecting a specific carrier, or even moving 100m down the road.
We have UK contracts with just over 1,000 handsets/sims and have had the carriers investigate this type of thing a number of times, and get this response most times.
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Current: Porsche Panamera 4S e-hybrid Sport Turismo
Past: 2018 BMW G11 740d MSport XDrive, 2015 Audi 3.0tdi A8L, 2012 Audi 3.0tdi A8L, 2009 Audi 3.0tdi A8, 2005 Jaguar 4.2V8 XJL, 2000 Jaguar 4.0V8 XJL + many others
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