Here's another hypothetical. Imagine you just became one of the world's most famous people overnight. The entire media apparatus, and a team of wikipedia editors, were racing to fill in every one of your biographical details, interview everybody who's ever known you, and put it all on the Internet for everyone to read. Are you sure you want anybody to be able to call your bank, answer the security questions you selected a decade ago, and wire all all your money to a bank account in the Caiman Islands?

I would not be surprised if the bank had gotten 50 such phone calls over the preceding two months. The fact that one of them happened to actually be Pope Leo is just the punchline. I'm sure there actually is a way to accomplish this without him coming to the US, but it should 't be accessible to a voice on the phone.