What do you mean the SMS authentication function is not turned on?

The related service or application is not enabled for SMS authentication. The phrase "SMS authentication function is not enabled" means that the related service or application has not enabled SMS authentication function. SMS authentication is usually used as a security measure to verify the identity of users. In many services, such as login account, payment verification and other scenarios, the short message received by users may be an authentication method. If the SMS authentication function is not turned on, related services or applications may not work normally, or the safety of users may not be guaranteed.