systemctl status bluetooth
/var/log$ grep blue syslog.1|more
i’ve tested it on a xbian installation…
and there i can’t connect as well - i will test with a clean OSMC (latest version - i used the 20150830 image on my working installation)
EDIT: you have changed the audio settings in Kodi to Pulse?
without changing this before connecting the device, i got the same error as you on a fresh osmc installation