Trouble with creating Apple ID
I am trying to create an apple id for my mom. I first used her phone number but when it came to phone verification, I entered the number and it keeps saying that password should include numbers and letters. I am confused as this is a verification code, why does it ask for letters? I tried using my phone number and it happens the same.
What should I do to fix this problem and create an apple id for my mom?
MacBook Air 13″, macOS 11.5