How to wire Atrium8 SDI speaker and ceiling speakers to Denon DRA-800H amp

I have 2 x ceiling speakers and these are wired to Output A on my Denon DRA-800H amp using the 4 terminal posts on the amp.

I recently bought the Atrium8 SDI speaker and wired this as a stereo speaker (using 2 x 2-core cables). The other end of these cables are wired to Output B on the Denon amp using the 4 terminal posts on the amp.

When I play music via Spotify through the amp, the sound is only coming through the ceiling speakers. What settings do I need to change so that I have the option to play music 1) simultaneously through both, the ceiling speakers and Atrium8 SDI speaker, and 2) only through the Atrium8 SDI speaker?

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