Was this ever resolved?
I’m having the same issue since updating to iOS 12.4.
All of my notifications and push alerts work fine except for icam.
I have tested icam on an older device to make sure all of my settings are correct and it works fine.
Years ago there was an issue with jailbroken or unlocked phones and a fix called pushfix was released to solve the problem.
Could this still be an issue? The older phone I tested with which worked was jailbroken and did not require pushfix.