An APN (Apple Push Notification) certificate is used by ERA MDM for iOS device enrollment. First, you need to create an Apple-provided push certificate and get it signed by Apple in order to enroll iOS devices to ERA. Also, make sure your ERA has a valid license.
Click the Admin tab > Certificates > Peer Certificates, click New and then select APN Certificate.
NOTE: You will need an Apple ID to get the APN certificate signed by apple.
Specify certificate attributes (Country code, Organization name, etc.) and click Submit request.
Download your CSR (Certification Signing Request) and a Private Key.
Once you have completed all the steps above, you can create a Policy for MDC to activate APNS for iOS enrollment. You can then Enroll any iOS device the same way as an Android device - by visiting https://<mdmcore>:<enrollmentport>/enrollment from the device's browser.