An APNS certificate is required for iOS management. APNS certificates can be used system-wide or for a specific organisation, as described in Services.
...
This article gives instructions for an organisation manager or master/vendor administrator, who needs to create an APNS certificate for an organisation.
...
You can create an APNS certificate through the following steps:
Create an APNS certificate signing request.
You can generate the private key and certificate signing request with the following command:
Code Block language bash $ openssl req -newkey rsa:2048 -keyout mysync-apns.key -new -out mysync-apns.csr -nodes -sha256 -subj '/CN=mySync APNS/'
Send it to the EMM vendor or supervisor
The EMM vendor or supervisor signs the request using an EMM signing certificate and sends the resulting file back
Upload the signed request to the Apple Push Certificates portal at https://identity.apple.com/pushcert/
Download an Apple-signed APNS certificate file (as created in the previous step)
Create a PKCS#12 file consisting of the private key and the Apple-signed APNS certificate
Upload the PKCS#12 file to the EMM service in the Configuration→Services view, in the Apple MDM tab, as described in Services.
The PKCS#12 is an archive file that bundles a certificate with a private key, as well as signatures.
...