Why isn't Galaxy S7 Edge not getting push notifications?

[Android Central Question]

I'm not getting push notifications from both my SimpliSafe app and Ring Video Doorbell Pro. SimpliSafe app says "communication unsuccessful check your connection and try again" and the Ring app sends nothing. They both have notifications turned on in the apps and on the phone.
My iPhone 7 and Galaxy Tab do get the notifications so it's not the apps. Neither Ring nor SimpliSafe tech support have been able to find a solution.

Galaxy S7 edge running Android 8.0, Samsung Experience 9.0.

 

[B. Diddy]

Welcome to Android Central! Make sure those apps aren't Battery Optimized in the system settings.

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