See the highlighted portions of the rule below. Vichy can supply other Axis units only while an Active Minor Ally. Before and after, not a supply source for non-Vichy forces.
49.2 Vichy France‘s status is now that of an inactive German Minor Ally, with three differences: Allied DoW on Vichy plus German Intervention is insufficient to activate Vichy; only the appropriate variant counter or the Vichy activation die roll described below can do this. An active Vichy yields no BRPs to Germany, only units for the German force pool. Vichy units remain on the board from the fall of France instead of being off-board awaiting activation. Vichy city functions as the capital of Vichy France between the fall of France and the conquest or deactivation of Vichy France. It is treated as an ordinary city at all other times.
DQB Is the city of Vichy a supply source for (1) Vichy units and/or (2) Axis units?
A. (1) Yes; (2) only if Vichy is activated as an Axis Minor Ally