class Devise::RegistrationsController

def after_inactive_sign_up_path_for(resource)

this method in your own RegistrationsController.
The path used after sign up for inactive accounts. You need to overwrite

def after_inactive_sign_up_path_for(resource)
  scope = Devise::Mapping.find_scope!(resource)
  router_name = Devise.mappings[scope].router_name
  context = router_name ? send(router_name) : self
  context.respond_to?(:root_path) ? context.root_path : "/"
end

Instance Methods