Hello @MaryBeth_Heydt ,
Please note that the Nucleus HDMI only shows diagnostic information and plays audio, it does not display lyrics or the now playing screen.
Additionally, I enabled diagnostics mode for your Nucleus and I noticed something strange here, which is that it doesn’t appear to be getting a proper IPv4 address. Are you using IPv6 in your setup? Can you try to temporarily disable IPv6 to see if the system works properly then?