But it only works if you receive it before two minutes after you request it. If you receive it hours later it won't ever work...

So, if every time you try to register you don't get the SMS before two minutes Yappari won't register it. If you receive it later there's nothing you can do, until Voice Method registration is implemented, so you can type the code manually.

ANYWAY: I registered your account manually so you can try running Yappari again and it should be registered already. Try it.