I use the CA CXN , the Azur 851 has the same streamer unit so should be ok
If you start up the CXN, it will check the network etc, make sure the Media Network is switched on options> media network
In the MC main tree view, Playing now section the CXN will show as a zone, select it and play.
I use JRemote as my control app and the CXN works fine. You need to set up views in options to customize the views.
CA Connect is a bit primitive compared to JRemote but does have the advantage of direct Tidal streaming
To set up views for CA Connect you Ned to go to Options>media network>set up DLNA views, that will customize the look and feel of CA Connect
Hope this helps, if in doubt shout , I have been using this setup for around 4 yrs , I have seen most of the quirks by now
Mike