Talk:Databases/@comment-70.27.115.90-20150420112110/@comment-24668482-20150614162714

The codes expire after 4-5 uses, after which they do not work. If the codes you try are more than a few hours-day then there is a good chance they have already been used 5 times. Some people who post on one forum will post the same code on numerous sites, so they expire very, very quickly. The best thing to do is to let the original poster know that their code has expired (which will let anyone else who wanted to try it know as well) and posting your own code for people to use in the friend code exchange area of the forum here.