Redemption Code not working - ] symbol at end of last 4 characters

I purchased Photoshop Elements.  I'm trying to put the redemption code into the adobe site to obtain a serial # so I can download it to my computer.  The Redemption Code has 6 groups of what should be 'numbers and letters' but the last set of 4 characters has a ] (bracket) as the last character.  It's not going through - "invalid number, please try again".  Any suggestions?