Universal containers want to make sure their customers can get access to their (authenticated) customer...

Enable Self Registration in the Community Builder and modify the Communities Self Registration APEX controller with the Community ID

Enable Self Registration in Community Settings and modify the Communities Self Registration APEX controller with the Account ID

Enable Self Registration in Community Settings and modify the Communities Self Registration APEX controller with the Community ID

Enable Self Registration in Settings and modify the profile lookup to associate the profile to the new user on creation

Enable Self Registration in the Community Manager and modify the Communities Self Registration APEX controller with the Account ID