diff --git a/index.js b/index.js
index b53cdb7..9f2d331 100644
--- a/index.js
+++ b/index.js
@@ -721,13 +721,19 @@ export default class ActivityPubEndpoint {
       );
 
       // Resolve the remote actor to get their inbox
-      // Use authenticated document loader for servers requiring Authorized Fetch
+      // Try authenticated document loader first (for Authorized Fetch servers),
+      // fall back to unsigned if that fails (some servers reject signed GETs)
       const documentLoader = await ctx.getDocumentLoader({
         identifier: handle,
       });
-      const remoteActor = await lookupWithSecurity(ctx,actorUrl, {
+      let remoteActor = await lookupWithSecurity(ctx, actorUrl, {
         documentLoader,
       });
+      if (!remoteActor) {
+        // Retry without authentication — some servers (e.g., tags.pub)
+        // may reject or mishandle signed GET requests
+        remoteActor = await lookupWithSecurity(ctx, actorUrl);
+      }
       if (!remoteActor) {
         return { ok: false, error: "Could not resolve remote actor" };
       }
diff --git a/package.json b/package.json
index f9408b5..7f719e7 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@rmdes/indiekit-endpoint-activitypub",
-  "version": "3.7.1",
+  "version": "3.7.2",
   "description": "ActivityPub federation endpoint for Indiekit via Fedify. Adds full fediverse support: actor, inbox, outbox, followers, following, syndication, and Mastodon migration.",
   "keywords": [
     "indiekit",