Why can’t the CCB authorization code sent by the Redmi mobile phone sender be sent out?

It may be a signal problem with the mobile phone.

When the signal is not good, we can try to move the position. Or let’s restart the phone and see. There may also be a delay in receiving the SMS code due to poor signal, so the authorization code cannot be sent. Generally, when we send it, there is a time limit, which is about 60 seconds.