Please follow these steps to make sure it validates your key properly:

1.) Enter your AS2012 key first - this is a common error people make

2.) Enter your ASA/ASE key

3.) IMPORTANT: There will be a drop down menu that ask what you are upgrading from - ASA or ASE - whatever product you have you must select ASE as the product
     (this is a known issue that should be resolved in future releases)

If you still get error messages after you have followed the above steps , please open a ticket.