My guess is the Accutrigger is not set properly or you are not pulling trigger properly. Be sure to press the blade first and then the trigger straight back. If your finger presses the main trigger first then the trigger will fall but the blade will not clear to allow the sear to fall all the way. Hard to figure it, though, because you say it is dry firing alright...
Still, try adjusting the pull weight. It is likely triggering partially but the safety blade is keeping the sear from falling. OR, the trigger is set so light it is dropping when you close the bolt. (Dropping, but the blade is still catching it, preventing a premature fire.)
To verify this is the problem, try to INTENTIALLY pull the trigger without touching the blade. You will see what happens when the blade is not pressed first like it is designed.
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