Why can't pp wealth management mobile phone get the first short message?

During the Spring Festival, PP financial platform cooperated with Tencent QQ Space to hold a large-scale activity of "Q monkey welcomes happiness". The participation and registration of this activity exceeded expectations, which led to the overload and instability of the platform system, which led to the abnormal login of some users' App or the failure to receive mobile phone verification messages, which has been gradually solved.