What's wrong with the doublejump?
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Yes, as the other guy said, double jump almost non-existent. Nowhere near the first jump height. Also, if you're doing it by adding force to a rigidbody, a good thing to do is to zero out vertical velocity first. Otherwise if the player was falling, best case is that double jump can slow down falling, not like allow to get more height.
Before you double jump, your velocity is set to zero, but I find with double jumps I find they can be a little OP if you leave them with the height of the first one. The double jump isn't meant to give you that much height, it instead just helps you get a little bit further. I have playtested the entire game to confirm the entire thing is possible.