Innovator Badge - Developer Edition issue

Hi there ! 

I'm trying to setup a DE org but I used it in the past with other emails and I can't create a new DE org for quoting agent.  

When putting my email as Username I get this error message : "Username is already used.Try another." 

And when I keep my email but use another Username (like the "epic.." email) I receive an email saying "Sorry we couldn't sign you up because you already have an account. Register with another email."  

Could you please help ? 

Thank you!