I am a US person living abroad . I tried to register with ID.me and got stuck on one of the last steps after scanning my face with my webcam, it asked for my phone number. ID.me said all my numbers were not valid, I assume they need a real phone number and not phone forwarding services like Google Voice that I use. I guess my only option to complete the ID.me signup is buy a US sim card, send it to my country, activate it and see if ID.me accepts it. I wish there was an easier alternative.