Qq mobile phone number is untied, how can I receive the message that my friend failed to help me?

Because the secret mobile phone number has not been untied.

QQ registration requires binding a confidential mobile phone number. When your friend invites you for supplementary verification, you will send a text message to your secret mobile phone number. When your friend's assistance fails, the text message will be sent to your secret mobile phone number, so you can still receive the text message because your secret mobile phone number is not unbound.

Under normal circumstances, if you forget your password in QQ, you need a friend to verify it when you complain. If the secondary authentication is successful, you can modify the password.