You have deployed Citrix Secure Mail via Microsoft Endpoint Manager for employees to access their on prem actyvesync mailboxes in iOS

Users notice they are getting Calendar events  but NOT email notifications

Despite having properly configured Securemail settings in Microsoft Intune as per our documentation users are still not getting email notifications

You see the following errors in SecureMail:

Push notifications are disabled from policy. Performing unsubscribe from push notifications
Unsubscribing from push notifications for accountId
 

1.- The setting PushNotificationsListenerServiceHostName is MISSING from Microsoft Intune SecureMail Settings
2.- Add the PushNotificationsListenerServiceHostName setting with the required value (e.g. for EMEA: https://eu-west-1.pushreg.xm.citrix.com)

https://docs.citrix.com/en-us/citrix-secure-mail/push-notifications.html#system-requirements-for-push-notifications

Problem Cause