The APNs for MDM settings page lets you generate or upload your Apple Push Notification service (APNs) certificate, which is required to manage Apple devices. If you do not already have one, you can generate a new one on this page. If you do have one, you can upload it here.

For more information, please see the Generating and Renewing an APNs Certificate for AirWatch KB article:  https://support.air-watch.com/articles/115001662728.