Update: It seems to connect to Stage and Beoplay M3. Level and Beosound 1 doesn't work.

Which Software version of Halo are you using?

It's 1.6.1262. But I think I managed to get it work. I tested with different Wifi channels on my router and I got my main speakers (Beosound Level, Beosound 1 and Beosound Stage) to connect. Do you know is it possible to mute the Halo? I'm talking about the system sounds like when you are adjusting volume. Based on what I found online it's not possible but double checking. It's weird that there's no option in settings, just brightness can be adjusted. Thought this would be easy to implement. Thanks.

I am having this same problem with a Halo I just bought 2nd hand.  App talks to remote just fine.  Remote shows up in router just fine.  Upgraded to newest software release just fine. However, remote cannot see any of my devices. I am curious what you may have done when you say you used "different wifi channels". Anyone have any insight here?  Could my Orbi mesh network be the problem (even though all my other devices - BLC, Balance, BS1, BS2, M3 all work fine)? Halo information on the internet is sparse. Thanks in advance.