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Check to make sure you're not in defog or defrost modes.

From the Owner's Manual:

Recirculation is available in the bi-level and vent modes.
If recirculation is selected in either floor/heat, floor/defog,
or defrost mode, the LED light will flash three times
indicating recirculation is not available in that mode.

Recirc is denied in defrost and defog because the outside air is usually less humid than the cabin air in conditions where window clearing is necessary. You want warm dry air directed to the glass, otherwise the humid inside air would condense on the glass and fog over, reducing visibility further.
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