Kindly follow the below steps to revoke the certificate:
1. Navigate to Package tab.
2. Select iOS platform at the top.
3.Spread the Platform Menu.
4.Click on Revoke button.
5. Console will prompt the Revoke Certificate Warning. Kindly click on " I understand. Revoke this certificate."
Your certificate will be revoked from the InstaVR console.
Hence, you will find an option to add new certificate.