A30 Volume no control when connected via ethernet to S10 preamp

I’ve connected S10 preamp with aux in onto dedicated network to A30 amp which is connected by powerline AV1000 network extenders. I receive music by the A30 but cannot adjust the volume on the A30 with remote when on ethernet. When in range of WIFI and come off ethernet I can adjust volume with remote. Anyway to remedy this? I was wanting to place amps on powerlines or wifi (if in range) in multiple rooms. If I can’t adjust amps with remote when hardwired I’ll have to add preamps, since phone with app can’t reach input S10. Help!!