My iPhone does not give text message notifications or vibration alerts, unless the BLUETOOTH function is TURNED OFF within SETTINGS (not from control panel). I have gone through countless other strategies to test: reset, sounds and haptics, accessibilities - vibration ON, etc etc etc.
Only when the Bluetooth function is turned off within settings, does this work. Turning Bluetooth off with the Control Panel, doesn't change this (I understand this method doesn't actually tuen off the Bluetooth, but keeps it on and doesn't allow connection to other devices).
This same issue happened 3 years ago with my iPhone 5s. I have done complete reinstalls on that old phone to try and remedy, to no avail, and have done them again with this iPhone 11 Pro while setting up the phone
Please help.