Hi Sstoward,
Have you tried 0000
Most default bluetooth passkeys are usually set as that.
I have also found the manual for this and it mentions the same passkey:
HCB-700 User guide
Regards
Mike
I got a "failed" when I tried to listen to my playlist, on the first song. I switched to a different song lower down the list, and then it worked. Not sure what made the difference.