Ok, don’t thank me until we see if it helps…
Here’s what I’m thinking, and it comes from personal experience. Perhaps with Bluetooth on, the phone is paired to something when you don’t expect that it is, which would mean the audio is playing through that paired device instead of the phone’s speakers.
I’ve often had my phone auto-pair to my car, had my car set to radio, and wondered why I couldn’t hear the maps navigation. In that case it’s because the phone is sending the audio to the car, but since I have the car playing the radio rather than the Bluetooth audio, i can’t hear it. The car can’t play both.
Other times, at work, I’ve had my phone paired to my headphones, put the headphones down on my desk and walked over to a “telephone room” to make a phone call. I place the call and wonder why I can’t hear anything. It’s because the call audio is still being sent to my headphones, which are still back on my desk. (And where you can hear my call recipient saying, “Hello? Hello? Southpaw? Hello?”)
I’ll let you draw your own conclusions about the fact that I have done these things and been baffled by them more than once.