Index: src/routes/posts.js
===================================================================
--- src/routes/posts.js	(revision 9eb6e1bceee7058678085d70abe8ff4dffe8bff8)
+++ src/routes/posts.js	(revision 86cfa1a2d9b65efe6ad3db8bd0411bedd61b0f82)
@@ -881,5 +881,5 @@
     try { target = await ActivityPubService.resolveRemoteNote(uri, site ? { asSlug: site.slug } : {}); } catch { /* ignore */ }
     // Not a post? Maybe the URI is a profile/actor → offer Follow, not reply.
-    if (!target) { try { followTarget = await ActivityPubService.resolveRemoteActor(uri); } catch { /* ignore */ } }
+    if (!target) { try { followTarget = await ActivityPubService.resolveRemoteActor(uri, site ? { asSlug: site.slug } : {}); } catch { /* ignore */ } }
   }
   renderPage(req, res, 'pages/authorize-interaction', {
Index: src/routes/search.js
===================================================================
--- src/routes/search.js	(revision 9eb6e1bceee7058678085d70abe8ff4dffe8bff8)
+++ src/routes/search.js	(revision 86cfa1a2d9b65efe6ad3db8bd0411bedd61b0f82)
@@ -120,5 +120,7 @@
   if (remote) remoteKind = 'note';
   if (!remote) {
-    try { remote = await ActivityPubService.resolveRemoteActor(remoteUri); } catch { /* onbereikbaar */ }
+    // Ook ondertekend: een profiel op een instance met authorized fetch
+    // (mastodon.social) geeft anders een 401 en leek dan niet te bestaan.
+    try { remote = await ActivityPubService.resolveRemoteActor(remoteUri, { asSlug: site.slug }); } catch { /* onbereikbaar */ }
     if (remote) remoteKind = 'actor';
   }