Denon HEOS iTunes Streaming and DRM

Hi there, I have a DENON HiFi and are part of the Apple Music monthly subscription, but are unable to stream from my iPhone through HEOS as a result of Itunes DRM issues. How can I resolve this as surely I should be able to stream my apple music which I pay monthly for through my AMP at home. Please could I have a fix for this? I have bought Itunes match, but still doesn't want to stream all the music, only one and far between?

Thanks

Clint