The wrong serial number of the Macbook

Hi! When I enter the confirmation of the serial number of my new Macbook into the Apple support system, she writes that the number is incorrect. My Macbook doesn't show up among my Apple devices. Even the old phone is displayed, but not my new Macbook. The store said that this is a problem on the part of Apple. And there are many more such cases. I bought it in the store from an authorized dealer. Tell me what to do?

[Edited by Moderator]