If you are trying to sign up for Enforecment United (which is currently in a beta state), you do not need to have been involved with the dashboard beta. You do need to be an Xbox Community Ambassador to participate in the beta of the Enforcement United XCL
Specialization, among a few other requirement that are listed on the site.
Did this solve your problem?
Sorry this didn't help.
Great! Thanks for marking this as the answer.
How satisfied are you with this reply?
Thanks for your feedback, it helps us improve the site.