Hi,
Apologies for delay in responding to this, seemed to have missed this.
I’m not sure why isn’t working from the gui, you may have more success from the command line.
DBMandrake posted some instructions sometime back, which look good to me. They can be found here
I’ve seen your post in [TESTING] Bluetooth audio streaming (A2DP) (this is when I realised I missed your topic), I don’t think its related, as you are having issues with pairing, not testing A2DP. Once you’ve the pairing issue resolved, and you wish to test A2DP; I’m sure your feed back would be welcome.
I hope this helps.
Thanks Tom.