I received a message from my QQ mailbox saying that my account was abnormally logged in from another place and asked me to scan the code to eliminate the risk. Is it credible?

Not credible. First of all, you need to identify whether it is an official Tencent email. Tencent’s official emails are all marked. If it is not a scam text message, ignore it. And to be on the safe side, it is best to change your password. If so, someone else may know your password and log in to your email address in a different place. You should change your password in time, and it is best to set a password.