Got my S10and this is my first time using Android Pie (9.0) as I'm coming from a S8. I use a bluetooth headset at work for calls and noticed that when I'm connected to bluetooth that all my notifications go to the headset and no notification sound comes from my phone. I was able to get notification sounds through both on my S8.
It seems to be a limitation of Android Pie. I'd really like to have my notification sounds come through my phone and my bluetooth headset as I don't have my ear buds in all day. Any work around or setting I'm missing?