My verification code isn’t coming through on my phone
Code for what?
You need to elaborate on exactly what you’re trying to do and what you’re seeing. Step-by-step, the more detail the better.
At a guess, I presume they’re trying to sign up with Monzo and aren’t getting the text message with a code to verify your number.
If that’s the case, double check you entered the correct number. Give it a few minutes, sometimes there can be a delay.