Commonspace platform is currently invite-only for creators and community owners. To sign up as a registered user, you can request an access invitation here. Only registered users may set up community spaces and/or join them.
After successfully signing up, you’ll want to check your registration email address for the activation link provided in a verification email. If you had started your registration process some time ago, this link may not work anymore. You can always sign up again with your email address at any time, or email Customer Support for assistance.