Probleme about notification

I builded a multisite application for a fast food business. I have one application used for the kitchen, one for the drivers and delivery and the admin app where by orders are entered. Up to here there is no problem. All sides receive their orders but my problem is that I want both the driver and the kitchen to receive a sound notification every time and admin insert an order for them so as to be alert if they aren’t infant of their mobile device.
I tried adding a trigger notifications to both the admin side and the kitchen list so as every new order should be notified but it does not work.
Does anyone have a solution or I idea for me to solution this problem please.
I heard there is a way to solution this problem out I tried looking out ont the internet about trigger notification but nothing really clear

If needed I can provide a clone of the app for does who need

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