Apple Push Notification Service Server Configuration

To ensure the proper configuration of your Apple Push Notification Service (APNs) connection and delivery of push notifications for different types of app builds (development or production), keep these points in mind.

APNs Server Selection: If you select the Development option, Marketing Cloud Engagement attempts to contact the Sandbox APNs server, regardless of whether you use a .p8 key or a .p12 certificate. If you select the Production option, Marketing Cloud Engagement attempts to contact the Production APNs server.
Apps Built Using Development Certificates: To send notifications only to those devices with apps on Debug configuration, select Development on the MobilePush Administration page in Marketing Cloud Engagement.
Apps Built Using Production or Distribution Certificates: To send notifications only to those devices with apps on Release configuration, select Production on the MobilePush Administration page in Marketing Cloud Engagement.