The developer certificate becomes invalid when the developer certificate becomes invalid.

The developer certificate becomes invalid when the developer certificate becomes invalid.

I feel that every step of the process will encounter problems and grow.

After applying for a developer certificate today and downloading it, the installation always shows that the issuer of this certificate is invalid.

Let's talk about the solution.

1. Open the key string and select to display expired certificates.

This is caused by the expiration of the security certificate of the Apple system.

2. Select in the key stringLogin-All projects

3. Enter the following expired certificate in the search box.

4. Delete the expired certificate.

5. Go to https://developer.apple.com/certificationauthority/applewwdrca.certo download it again. Then, install it in double steps.

The developer certificate becomes valid.