How to remove a bad certificate in IPhone 11 pro

Hello Newrose85.

Thanks for reaching out to Apple Support Communities. We understand that you would like to remove a certificate from your device. We will be glad to assist.

Please see the following resource:

Certificate deployment for Apple devices

"Remove and revoke certificates

A mobile device management (MDM) solution can view all certificates on a device and remove any certificates it has installed.

Additionally, the Online Certificate Status Protocol (OCSP) and Certificate Revocation List (CRL) protocol are supported to check the status of certificates. When an OCSP- or CRL-enabled certificate is used, iOS, iPadOS, and macOS periodically validate it to make sure that it hasn’t been revoked.

To manually remove an installed certificate, go to Settings > General > Device Management, select a profile, tap More Details, then tap the certificate to remove it. If you remove a certificate that’s required for accessing an account or network, the iPhone or iPad can no longer connect to those services."

Cheers.