Why no last-minute German decision could reverse D-Day

Was there a tactical decision Germany could have made on or near D-Day that would have turned the invasion into a failure?

Not realistically; Allied combined power and reinforcement capacity met German logistics weaknesses that no single last-minute order could repair.

Allied air and sea power protected a land force that could be reinforced faster than Germany could restore balance while fighting the Soviet Union. German rail and supply systems lacked the capacity to sustain both fronts effectively. Part of that weakness came from the interwar loss of engineers and logisticians, so D-Day's outcome was shaped years before the landings rather than by a single missed order.