diff --git a/lib/federation-setup.js b/lib/federation-setup.js
index 42669ba..ce7be8c 100644
--- a/lib/federation-setup.js
+++ b/lib/federation-setup.js
@@ -162,6 +162,13 @@ export function setupFederation(options) {
     storeRawActivities,
   });
 
+  // Enable authenticated fetches for the shared inbox.
+  // Without this, Fedify can't verify incoming HTTP Signatures from servers
+  // that require authorized fetch (e.g. hachyderm.io returns 401 on unsigned GETs).
+  // This tells Fedify to use our actor's key pair when fetching remote actor
+  // documents during signature verification on the shared inbox.
+  inboxChain.setSharedKeyDispatcher((_ctx) => ({ identifier: handle }));
+
   // --- Collection dispatchers ---
   setupFollowers(federation, mountPath, handle, collections);
   setupFollowing(federation, mountPath, handle, collections);
@@ -187,6 +194,14 @@ export function setupFederation(options) {
     };
   });
 
+  // Start the message queue for outbound activity delivery.
+  // Without this, ctx.sendActivity() enqueues delivery tasks but the
+  // InProcessMessageQueue never processes them — activities are never
+  // actually POSTed to follower inboxes.
+  federation.startQueue().catch((error) => {
+    console.error("[ActivityPub] Failed to start delivery queue:", error.message);
+  });
+
   return { federation };
 }
 
diff --git a/package.json b/package.json
index 035dd99..592bff5 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rmdes/indiekit-endpoint-activitypub",
-  "version": "1.0.7",
+  "version": "1.0.8",
   "description": "ActivityPub federation endpoint for Indiekit via Fedify. Adds full fediverse support: actor, inbox, outbox, followers, following, syndication, and Mastodon migration.",
   "keywords": [
     "indiekit",