How to run a request on Overpass-Turbo - with the correct ISO 3166 -

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Do you mean this region ? https://www.openstreetmap.org/relation/8636

In that case, you can try

area["ISO3166-2"="FR-A"]->.a;
( nwr(area.a)[tourism=apartment];
 nwr(area.a)[tourism=chalet];
);
out;