I am not able to change my license through your automated system

I am not able to change my license through your automated system http://api.muffingroup.com/licenses/

I am getting the following error:
Wrong username or purchase code.
Please use only purchase codes that has been used to register the theme and the username used at the time of purchase.

I am pretty sure I am entering the correct purchase code and name.
Can somebody assist me please? 

Thanks

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