Index: src/services/guardianship/gated.js
===================================================================
--- src/services/guardianship/gated.js	(revision 88d7c8fc087ab49a2fd3ee63bf184d15d1f0fa31)
+++ src/services/guardianship/gated.js	(revision e27b8db4e316874f7498fbe36e20270bc39b1d7f)
@@ -56,5 +56,8 @@
 
 /** The column a feature maps onto. Unknown features are refused, not guessed. */
-const FEATURES = { 'shaer:externalEmbeds': 'external_embeds' };
+const FEATURES = {
+  'shaer:externalEmbeds': 'external_embeds',
+  'shaer:externalPlayback': 'external_playback',
+};
 export function featureColumn(feature) {
   return Object.prototype.hasOwnProperty.call(FEATURES, feature) ? FEATURES[feature] : null;