If the app has been trusted and still cannot be verified, you can take the following steps, taking iPhone7 as an example:

1. First open the mobile phone desktop, find the App Store, and click to enter.

2. Then we search for program names that could not be verified before in the App Store.

3. Then you can find the program and open the program introduction page.

4. We can find the privacy policy of this program by sliding up the screen.

5. Find the four words “Contact Us” in the interface and click to open.

6. Finally, we enter the developer contact interface, where we can ask them to re-sign the certificate, upload the program, and the operation is completed.