there might be several reasons why your email address is not recognized:
Check that you have a valid ticket and are correctly registered.
Make sure that the email address you enter is the same used for the ticket registraton.
Write your email address correctly , it's possible a mistake was made when registering. Do not hesitate to contact us to verify it for you.
Note that an email address can only be used for one person. If several people have registered with the same email address, you will need to contact us.