Bluetooth transmitter

So I have bought a sennheieser BT T100 I have connected it to my Rose RS520. It is recognised and found under Bluetooth. My Apple max headphones connect to the blue tooth transmitter but there is no sound. I have used the optical out on the Rose and optical in on the transmitter. I also change the source to optical out. The screen says playing Bluetooth audio, but there is no audio there. What is it I have done wrong. Please help as at night I have to use a pair of headphones. Thanks Caz

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