system enhancements...
sending mobile web push notifications on iOS and iPadOS (16.4+) requires notification recipients to: visit your website on your Safari, Chrome, or Edge browser on a mobile Apple device on iOS/iPadOS 16.4+ 
andriod
windows
macos
click on the share button of browser on mobile device. click on the add to home screen option. save the app on device. open app from the home screen. subscribe to notifications (must click subscribe button before a native permission prompt can be displayed). these steps are required to receive mobile web push notifications.
phone additions...
sending mobile web push notifications on iOS and iPadOS (16.4+) requires notification recipients to: visit your website on your Safari, Chrome, or Edge browser on a mobile Apple device on iOS/iPadOS 16.4+
andriod windows macos click on the share button of browser on mobile device. click on the add to home screen option. save the app on device. open app from the home screen. subscribe to notifications (must click subscribe button before a native permission prompt can be displayed). these steps are required to receive mobile web push notifications.
phone additions...