Dirac Live is supported on the following models
TX-NR7100, TX-RZ30, TX-RZ50, and TX-RZ70
Issue: Dirac Live App says: No Devices Found
Please take a look at this article.
It's best to follow this suggestion to ensure that the issue is not due to network setup
*You could also try to setup your smartphone or computer as an "Internet Hot Spot", sharing the existing internet connection. Connecting to the AVR through this smartphone or laptop Hot Spot might do the trick. If so, there is some kind of trouble with the router or any other network related devices within your setup.