I was thinking maybe Germany. The shrinkage of the French colonial empire would mean more territory for the Reich. In this timeline, Germany presumably controls everything that they lost in 1918, except for the French Congo, with the Reich's own twisted version of Mittelafrika.
From Wikipedia: Approximate location of
Mittelafrika in medium blue and dark blue, with pre-World War I colonies in dark blue. Light blue are possible additions, including Portuguese colonies.
The colonies you see in medium blue are the colonies they're going to take from their defeated enemies. This gives Germany a powerful foothold in African colonial affairs. Africa is bound to be a continent of proxy wars between Germany and Free France, with both sides supporting local factions fighting against each other. Free France is going to do whatever it takes to keep Germany from consuming any more territory which could put their government in exile at risk.