Sorry loks like I missed this one. You are using an event as a trigger and it need to have an ON / OFF state. I wish manufactures would provide an ON / OFF state or at least an option to have it… double tap = ON double tap = OFF. This way we wouldn’t need to do anything. You try and create a toggle helper and toggle that helper ON and OFF when you double tap. You then use that helper in the blueprint. If your not sure how to create a template binary sensor then you can try this blueprint 
Press Button - Turn ON & OFF Entities.
Blacky 