Needed to come first

config/routes.rb

@@ -18,6 +18,10 @@ Rails.application.routes.draw do
     resources :cards
   end
 
+  namespace :cards do
+    resources :previews
+  end
+
   resources :cards do
     scope module: :cards do
       resource :engagement
@@ -41,10 +45,6 @@ Rails.application.routes.draw do
     end
   end
 
-  namespace :cards do
-    resources :previews
-  end
-
 
   resources :notifications, only: :index
   namespace :notifications do