1. You need to open the WeChat public platform and enter the "Settings-WeChat Official Account Settings-Authorization Settings" page.

2. On the authorization page, you need to find the rejected third-party application and check the corresponding authorization item.

3. After confirming the authorization, a prompt box will pop up. Please check it carefully and click the "authorize" button.

4. After the authorization is successful, return to the setting page of WeChat public platform.

5. After re-authorization, you can reset the functions and permissions of the official WeChat account.