So, this made me insane. I use an LG Bluetooth headset constantly and I'm on call for work and HAVE to get my text messages. If I didn't have the earbud in, I didn't get any kind of notification. I finally sort of fixed mine by turning off the "separate app sound"
- sound and vibration
- advanced sound settings
- separate app sound.
I tried this with several messaging apps. Including the Samsung, Verizon Message +and Next SMS. Now I don't get a notification in my headset, and my headset doesn't vibrate but I hear my notifications ring tone....
Samsung chat told me to clear my cache. Here is the video link they gave me. I'm waiting to see if it works. It did not wipe any personal data when I did it.
Had the same problem and fixed it. Go to bluetooth and tap the three dots in the top right corner. Tap "advanced". Uncheck "ringtone sync".
Bluetooth device should disconnect and reconnect. That fixed it for me.