I have a possibly related issue: Roon Core running fine on Mac mini M1 OS 11.2 hardwired–sees and plays to both hardwired (CA CXN)and wifi (airplay) endpoints perfectly. Now trying to set up M1 MacBook Pro as occasional endpoint to headphone DAC/AMP stack (will eventually replace with Pi-based unit); Roon on MacBook won’t connect to Roon Core, and M1 Mini Roon Core doesn’t see MacBook–this feels like a network setting somewhere.