Does the patent application number and WeChat official account mean authorization?

No, when the patent is granted, the patent office provides the patent number (similar to the patent application number).

From the date when the patent application documents are submitted to the Patent Office (the filing date), the Patent Office assigns a patent application number;

When an invention patent is published after preliminary examination, the patent office shall provide the patent publication number;

When the patent authorization is announced, the patent office shall provide the patent announcement number (similar to the patent announcement number);