Ok on bluestacks you entered in the code 1 time so it is remembers that account as the last use so the next time you register it, it won't need to use the code.

what to do? delete the account and try to register a different account so it forgets your account. might need someone else's number for that. that might work.

Edit: BTW it is really annoying on all these posts about simple problems that have already been mentioned in previous posts. everyday the post count for this thread goes up by a few hundred and we have to read through all the pointless posts just to get to the main posts. Please people do NOT post things that have already been mentioned. If you get a problem in wazzap, Use the search button on this thread and search for the problem most likely it will be mentioned already and there will already be responses to those problems.