Please review below points: How do you subscribe HTTPS endpoints to your SNS topics? (Amazon SNS console [1], the sns-subscribe command [2], or the Subscribe API action [3]) Do you see any errors during this process? Could you please confirm the HTTPS endpoints have the capability to handle the HTTP POST requests that Amazon SNS uses to send the subscription…

Failure to display push notification could be due to various reasons. The most common case is the application has NOT enabled push notification on the device. You could enable this by going into Settings > Notifications on the device. If the notifications are enabled, you could try and install the application on another device to see if the notification goes…