Couldn’t say without hearing it, but you wouldn’t select Dolby Surround for an Atmos track. DS is their upmixer just like dts nueral X. You would select that for legacy disks without an Atmos track. Maybe that’s part of your deal? If it allows you to choose “Dolby surround” you may have NOT selected the Atmos track in the disk menu. The display should say Dolby Atmos, not Dolby Surround. Sometimes they default to the Atmos track and sometimes they don’t. I ALWAYS check the disk menu every single time I watch a movie, just to make sure I’m getting the track I want.