Just for the record, the android and ios versions are VERY different. Friend codes that start with XBB are only for iOS. For android users the code must start with WBB. There are also no guilds on android. On android, there is no notification for a friend request and no notification for you if some one uses your code. You can not complete that quest if you are on android. You can only tell if some one accepts by going to the friends tab and seeing if you have more friends than you did yesterday. Hopefully they will fix this soon with an update. Good luck.