Roon remote couldn't used as endpoint

I’m not sure I’m understanding you correctly here but, If you want to control Roon playback from another device than the one that the Mojo is connected to, you either have to

  • install and run Roon (and leave it open) on the ASUS your Mojo is connected to
  • install and run Roon Bridge on the ASUS your Mojo is connected to

prior to be able to do so. Make sure the zone is not marked private in device setup (Settings|Audio|Cog-wheels).

Even if this document is titled Roon Server, the containing section about the ‘Launch at startup’ option also applies to the use of Roon Bridge.