I found on the Internet that the patent has been authorized, but I haven’t received any notification.

It depends on the type of patent application you have.

If it is a utility model or design patent, the authorization is public, and you can receive the patent certificate in two weeks, unless the mailing address you left with the Patent Office is wrong.

If it is an invention patent, the first disclosure is after passing the preliminary examination, and it is still far from authorization.