Why can't I request another one-time verification code?

For security reasons there are different limits to how many codes you can request, depending on what you're using the code for. Sometimes you can only request a code once.

Not received a code? 

It can take a few minutes from us generating your code to it being received by your phone. Please check your phone signal and that your number is up to date.  If you haven't received your code after a few minutes you'll need to start the process again.