If configuration is proper at SapphireIMS server end as described in article - How do we get notifications in MobileApp? then you may need to check whether notification permission is provided to SapphireIMS MobileApp in mobile device.
If configuration is proper at SapphireIMS server end as described in article - How do we get notifications in MobileApp? then you may need to check whether notification permission is provided to SapphireIMS MobileApp in mobile device.