Remote on android phone not connecting

I’ve had Audirvana Plus for a few years and remote installed on my Ipad which works fine. Now I installed the remote app on my Samsung phone(S7 Edge), it see’s my Mac mini, but when I go to connect it say’s
“Error”
“unknown error”
The firewall on the mini is off, so that’s not it and the phone and mini are on the same network.

Thanks
Jeff