In AA50, France has an AA gun only in the later (42) set up. They don’t get one in the 41 set up. Maybe they felt that Germany over time set up more AA def then what France had originally? It does seem kinda weird that a world power like France that knew the Germans were eventually going to attack, wouldn’t have better AA def though. It must be for game play, if the French had an AA gun they would have had to bump the Luftwaffe to account for it. This would have made the Euro game out of balance compared to the Pac as far as air (yea I am joking). Maybe it had something to do with France surrendered before the German’s sacked the capital, and they left their AA gun in Paris (LOL).
France may have had a large army at the time, but its command structure had not changed much from WW I, and in fact some of the generals in charge were WW I holdovers. I believe Gamelin set up his headquarters in a remote castle without telegraph lines.
And of course, they thought that the Maginot line was going to do the defending for them.