Issues with Volume on 250

I’m fairly new to hifi rose and have been trying it’s 250 streamer out and it’s great. However, my only issue is that there is an issue with volume control while in the HIFI Rose app. Tidal airplay allows for volume control from my phone but the app doesn’t. Is this due to me using it as a streamer while being connected to a receiver? Just can’t understand why that would happen. Is there a fixed volume setting that I might have enabled?