Which A50's are they ?
You will need the Dolby Atmos App, which I am sure you can trial and then you have to Purchase.
In the settings you have to have it selected for Optical Out for Headsets to be Atmos and then you turn off Dolby Digital on the Astros Amp thingy.
Windows Sonic is also pretty decent imo.
Try all 3 and see what sounds best to you.