Not may people ring me ☹️ so I don't know how long I've had this issue. Whilst running Navigator in my car with the bluetooth connected to the radio (and listening to the radio, don't know if that's relevant) when someone rings me I can hear them but they can't hear me. Turn off Navigator and all is well.
Check the settings of your Navigator app and see if there is an option to mute or lower the volume of the voice guidance. This might prevent the app from taking over the microphone when you receive a call. Best Bathroom and Kitchen Remodeling Services in USA