I have spent a few hours on this. The triggers are working and and are all on the same channel but I cannot get the flash to fire.
The camera settings shouldn't matter, but I don't use a D5x00 so I don't know what different settings it might have.
Make sure that:
- the flashes are in radio slave mode
- the trigger and the flashes are on the same radio channel
- the group to which the flashes are assigned is set to fire on the trigger
If all of these were already true, try turning everything off and then turning it back on in this sequence: flashes, then trigger, then camera. (Also make sure the trigger is already on the camera before you turn everything on.)