Cluster operator authentication is degraded with certificate error in logs

Issue

• RouterCertsDegraded: secret/v4-0-config-system-router-certs.spec.data[apps.example.com] -n openshift-authentication: certificate could not validate route hostname oauth-openshift.apps.example.com: x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "MyCorp Issuing CA")