The certificates created by ESET Security Management Center MDM version 7.0 do not comply with Apple iOS 13 requirements.
Current ESMC MDM users
If you upgrade to iOS 13 before having the certificate, you must re-enroll affected devices using a compliant certificate.
New ESMC MDM users
If you are going to manage Apple devices using ESMC MDM, verify you have an Apple iOS 13 compliant certificate before starting the enrollment.
Getting a compliant certificate
Obtain the Apple-compliant certificate from a trusted vendor.
If you cannot resolve your issue, email ESET Technical Support.