The voting offices are supposed to be adapted to the amount of French citizens in the area. Here in Belgium there are 12 of them for example. It's possible tha

The voting offices are supposed to be adapted to the amount of French citizens in the area. Here in Belgium there are 12 of them for example. It's possible that the consulate of Montreal misjudged the amount of voters (the turnout in 2017 was higher than expected for the citizens living abroad, if I recall correctly) but more generally, citizens are expected to make the effort necessary to cast their vote.