Check, at what I remember there is 2 options, one is a "password" the other one is a "key". Perhaps you use the wrong one (it's a key and you put it as a password, or vice-versa). There is also various WPA, WPA2 and as well encryption methodes TKIP or AES or Both together.

You can always downgrade to TKIP only or AES only the encryption, try the different combinations.

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