Why Android users sometimes cannot receive the message of verification code when registering a Clockgogo Staff Mobile App account?

If Android users have installed anti-virus App (e.g. 360 Security, AVG Antivirus, Antivirus & Security, etc.) in his / her mobile, the message may be blacklisted by the App.
Android users can go to “Message Blocker / Filter” of the anti-virus App to double check whether there is any blocked message starting with ‘‘Clockgogo Staff verification code: ……’’.
Remarks: For Xiao Mi smartphone, such information will be recognized as notification message.