Hi,
As far as I know, we can change the notification configuration via registry(as below mentioned), and we can turn off the notification via GP and prevent user from change it. However, it would be difficult to keep the notification configuration on and prevent user from change it via group policy.
Computer\HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\PushNotifications\ToastEnabled
Note:
Service Windows Push Notifications User Service or system restart is necessary to make the registry change take effect.
As workaround, you may consider of changing the setting to on via script once it is detected that the setting is disabled. As write script based on customer’s requirement is beyond our support scope, we are unable to provide you detail suggestion.
Thank you for your understanding.
Best Regards,
Eve Wang