Hello, I moved from the United States to Germany in February and have my residence permit since March. The document I uploaded clearly is from Germany, not USA.
I am not able to check anymore but it could indeed have been that my phone was on a US-connection (because I still have my old US phone membership and sometimes still use it to watch videos on my phone which require a US IP-address) while I was doing the verification. This was unintentional but I think it is a way too quick judgement to think that if a person 1 time (possibly) logs in from a US IP-address he or she immediately is from USA. As you can see in my account history all of my account activity was done from my German IP-address and no VPN was ever used.

As I said, I uploaded a legal German document as my ID, and if you want I can also provide you a recent German utility bill