1. Authentication information has been used. You can try to change the authentication information, such as changing your mobile phone number or email address and re-authenticating.
2. If changing the certification information can't solve the problem, you can contact the customer service department of Beijing Dance Academy and ask them for specific information and help.
3. If the above two methods still fail to solve the problem, you can consider re-registering a new account and using new authentication information for authentication.