No signal on fx returns

So I’m trying to mix muti tracks on my avantis over Dante however, when I send tracks (eg vocals) to any of my fx busses I do get send signal however no return signal, not even on the fx rack. I have a couple of deessers inserted over some other channels which work, it’s just the reverb, delay etc busses which I’m not getting return signal from and it also says on the back of the rack that it’s going to fx return however it doesn’t. I saw someone asked something similar to this not that long ago but was unsure if they got an answer, I’m aware it’s probably something small that I’m missing, any help would be much appreciated :stuck_out_tongue: