1. From the iPhone, touch Settings

2. Touch Notifications

3. Touch Show Previews
4. Select Always or When Unlocked

5. Under NOTIFICATION STYLE select an app you want to receive notifications from
6. Toggle Allow Notifications on, ALERTS options should all be checked, and Show Previews must be set to Always (Default) or When Unlocked as shown below:
NOTE: With iOS 13, Apple now requires Show Previews to be set to Always or When Unlocked to get notifications on any connected device.
7. Repeat steps 5-6 for all apps you want to receive notifications from