What does it mean when Zhejiang Provincial Market Supervision Bureau sent me a verification code?

It means someone has logged in with your mobile phone number.

If you are not doing anything that requires a verification code, leave him alone. It may be that someone else filled it in incorrectly when registering, or it may be that someone else is using your phone to do bad things. If you have registered on this platform, it is possible that someone else is using your account. So it's best to leave it alone.