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Note that not only do you have to supply the key in the correct format, you also have to capture the session setup handshake (EAPOL) as noted in the "Gotchas" section on the Wiki page.

Unfortunately the Wiki page you reference is somewhat out of date. WPA2 decryption is supported by all recent versions. If running on Windows or macOS then you should update to the stable 2.4.x version. If using Linux you may be stuck with whatever your distribution provides.