I am not sure if you were able to find the information posted about potential fixes for this issue. I will post them again here for your knowledge. I hope this information helps...
Problem: No Audio when connected to Bluetooth Speaker / Headphones
How to clear browser history:
As stated in my post Here, you can also try the following steps...
1. Updating and possibly downgrading headphone firmware. (I personally have had experience with syncing Bluetooth devices only to have an update cause issues. Sometimes upgrading or downgrading the firmware allows overlooked protocol's to be used with updated software. You can visit the Bose Device Updater Here)
2. Updating and possibly downgrading Adobe Flash Version. (As stated before as this is a know issue with this version of Flash. You options to wait for the next Flash update or to roll back to a previous version to see if this fixes the issue. In my experience having a lower version of Flash Player can fix connection issues but you have to make sure to uninstall the current Flash version first and you may need to reboot your system. The Minimum Flash Player requirement Xfinity TV is version 15 or higher. You can find different versions of Flash Player Here.)
3. Use other browsers to connect. (As stated above the use of other browsers like Chrome or Firefox, but many find the need to use Microsoft Programs for multiple program needs. I personally have found that bypassing MS Edge and using the IE 11 built into the system can resolve this limitation. You can learn more on using IE 11 as the default browser instead of MS Edge Here.)
If this issue persists beyond these fixes please send a private message so I can better assist you. Thank You