Spotify not playing through Musiccast

[Peter678]

Plan

Premium

Country

 Australia 

Device

Yamaha Music Cast 

Operating System

 Android

My Question or Issue

Everything was working perfectly, could open Musiccast on my Android tablet, select Spotify and play music through my Yamaha amp.

Then on Christmas Eve this option stopped. I can still use Musiccast on my tablet to play using tuner and USB etc but when selecting Spotify it only plays through the tablet speakers.

I have tried to select devices so I can select the amp but it is no longer shown as an option to select.

If I connect a wifi speaker to the tablet then Spotify plays through it normally.

I've tried on my Galaxy phone which also used to work and this has exactly the same issue.

The problem is Spotify refuses to recognise the Yamaha amp through Musiccast. 

What can I do to get Spotify play over Musiccast to my amp again please?