Why is my message bound to Tencent's mobile phone housekeeper always showing that my message has not been delivered?

When a mobile phone sends a short message, it always shows that the message has not been delivered, which means that your short message has not been sent successfully. The reason for the failure may be that your mobile phone is in arrears and cannot be sent out. This function has been turned off for you. It may also be that the other party's mobile phone has deleted you from the blacklist, so whether you call him or send a text message will not succeed.