It's half working for me.
I can see the MC200 and the "Control:PC" program on my PC but not the 210.
I can only connect to the 210 via bluetooth.
The 210 has an IP address and I can see and play to it in Tidal and Roon on the PC or any app.
But the new app just won't find it.

Main: Marantz Cinema 50, Meridian 271, DSP7200.2, DSP5200HC, DSP5000 rears, Meridian 210.
PC/Headphones: Mytek Liberty II, Sansui CA-F1, Sansui B-2301, Sennheiser HD800, Kef R3