Edge cases like immigrants in a different land are typically unmet for these things. I remember once trying to re-activate my Google Fi SIM from my home in the UK before I returned to the US and getting a strange error message that didn't allude to the region. I got the rep on the line and they said "You're in the US, right?" and I had to bullshit something about "oh I had my VPN on" and then turned it on so I would like I was in the US and it worked then.
Anyway, there's clearly one cause and the rest is just kitchen sink argumentation.