BC127 I2S output

Hi,
my configuration is: phone -(via bluetooth)- BC127 digital audio output (I2S) - I2S amplifier (MAX98357A) + speaker
AUDIO=1 1
AUDIO_DIGITAL=0 44100 64 100A00 ON (I2S MASTER)
Also I have tried different ROUTEs but I don´t get any music playing.
Is this configuration right?