It is possible that the verification did not go well the first time (for example if the app freezes), but that your number still has been registered.
Restart the app and select the option “log in” (and not “create account”). You should then receive an SMS. Once in the app, you can continue to register. It is not necessary to log out again!
If the issue persists, submit a request and we’ll get back to you as soon as possible.