No bluetooth sound in Spotify Version

[passuff]

I was able to set up bluetooth with non Spotify version immediately but not on the Spotify version. I tried the following settings without success. I can play sounds with "aplay" but phoniebox does not work.

/etc/mopidy/mopidy.conf

[audio]
output = alsasink device=btspeaker
mixer_volume = 30

/etc/mpd.conf

audio_output {
        type            "alsa"
        name            "My ALSA Device"
        device          "btspeaker"     # optional
        mixer_type      "software"      # optional
#       mixer_device    "default"       # optional
        mixer_control   "Master"        # optional
#       mixer_index     "0"             # optional
}

/etc/asound.conf

pcm.btspeaker {
    type plug
    slave.pcm {
        type bluealsa
        #service "org.bluealsa"
        device "0C:A6:94:AF:0E:23"
        profile "a2dp"
        #delay -20000
    }
    hint {
        show on
        description "Medion Partybox"
    }
}