diff --git a/app/Federation/Handlers/QuoteRequestHandler.php b/app/Federation/Handlers/QuoteRequestHandler.php
index 7c0c19d27..75c3a680a 100644
--- a/app/Federation/Handlers/QuoteRequestHandler.php
+++ b/app/Federation/Handlers/QuoteRequestHandler.php
@@ -3,6 +3,7 @@
 namespace App\Federation\Handlers;
 
 use App\Federation\ActivityBuilders\QuoteRequestActivityBuilder;
+use App\Jobs\Federation\DiscoverInstance;
 use App\Models\Comment;
 use App\Models\CommentReply;
 use App\Models\Profile;
@@ -25,6 +26,11 @@ class QuoteRequestHandler
      */
     public function handle(array $activity, Profile $actor, ?Profile $target = null): void
     {
+        // Ensure we discover the instance if this is a new remote actor
+        if (! $actor->local && $actor->uri) {
+            DiscoverInstance::dispatch($actor->uri)->onQueue('activitypub-in');
+        }
+
         $quotedObjectUrl = $activity['object'];
         $quotePostUrl = is_array($activity['instrument'])
             ? ($activity['instrument']['id'] ?? null)
@@ -160,6 +166,31 @@ protected function approveQuoteRequest(
         string $quotePostUrl,
         Profile $quoterProfile
     ): void {
+        // Ensure the quoter profile has an inbox URL for delivery
+        if (! $quoterProfile->inbox_url) {
+            // Try to re-fetch the actor data to get the inbox URL (bypass cache)
+            $actorData = app(\App\Services\ActivityPubService::class)->get($quoterProfile->uri, [], true, true, true, true);
+
+            if ($actorData && isset($actorData['inbox'])) {
+                $quoterProfile->inbox_url = $actorData['inbox'];
+                $quoterProfile->shared_inbox_url = data_get($actorData, 'endpoints.sharedInbox');
+                $quoterProfile->save();
+
+                // Discover the instance since we're seeing it for the first time
+                DiscoverInstance::dispatch($quoterProfile->uri)->onQueue('activitypub-in');
+
+            } else {
+                if (config('logging.dev_log')) {
+                    Log::error('QuoteRequest handler: Failed to fetch inbox_url for quoter', [
+                        'quoter_id' => $quoterProfile->id,
+                        'quoter_uri' => $quoterProfile->uri,
+                    ]);
+                }
+
+                return;
+            }
+        }
+
         $existing = QuoteAuthorization::where('quote_post_url', $quotePostUrl)
             ->where('quotable_type', get_class($quotable))
             ->where('quotable_id', $quotable->id)
@@ -212,6 +243,30 @@ protected function approveQuoteRequest(
      */
     protected function rejectQuoteRequest(array $activity, $quotable, Profile $quoterProfile): void
     {
+        // Ensure the quoter profile has an inbox URL for delivery
+        if (! $quoterProfile->inbox_url) {
+            // Try to re-fetch the actor data to get the inbox URL (bypass cache)
+            $actorData = app(\App\Services\ActivityPubService::class)->get($quoterProfile->uri, [], true, true, true, true);
+            if ($actorData && isset($actorData['inbox'])) {
+                $quoterProfile->inbox_url = $actorData['inbox'];
+                $quoterProfile->shared_inbox_url = data_get($actorData, 'endpoints.sharedInbox');
+                $quoterProfile->save();
+
+                // Discover the instance since we're seeing it for the first time
+                DiscoverInstance::dispatch($quoterProfile->uri)->onQueue('activitypub-in');
+
+            } else {
+                if (config('logging.dev_log')) {
+                    Log::error('QuoteRequest handler: Failed to fetch inbox_url for quoter (reject)', [
+                        'quoter_id' => $quoterProfile->id,
+                        'quoter_uri' => $quoterProfile->uri,
+                    ]);
+                }
+
+                return;
+            }
+        }
+
         $reject = QuoteRequestActivityBuilder::buildReject(
             $activity,
             $quotable->profile
diff --git a/app/Services/ActivityPubService.php b/app/Services/ActivityPubService.php
index 61866c43d..aa5673f18 100644
--- a/app/Services/ActivityPubService.php
+++ b/app/Services/ActivityPubService.php
@@ -10,7 +10,7 @@
 
 class ActivityPubService
 {
-    public function get($url, $params = [], $signed = true, $validateUrl = true, $validateContentType = true)
+    public function get($url, $params = [], $signed = true, $validateUrl = true, $validateContentType = true, $bypassCache = false)
     {
         if ($validateUrl) {
             $valid = app(SanitizeService::class)->url($url, true);
@@ -21,9 +21,11 @@ public function get($url, $params = [], $signed = true, $validateUrl = true, $va
 
         $cacheKey = 'activitypub-fetch:'.sha1($url.json_encode($params));
 
-        $cached = Cache::get($cacheKey);
-        if ($cached !== null) {
-            return $cached;
+        if (! $bypassCache) {
+            $cached = Cache::get($cacheKey);
+            if ($cached !== null) {
+                return $cached;
+            }
         }
 
         $lock = Cache::lock('activitypub-fetch_lock:'.sha1($url.json_encode($params)), 10);
@@ -31,17 +33,19 @@ public function get($url, $params = [], $signed = true, $validateUrl = true, $va
         try {
             $lock->block(10);
 
-            $cached = Cache::get($cacheKey);
-            if ($cached !== null) {
-                return $cached;
+            if (! $bypassCache) {
+                $cached = Cache::get($cacheKey);
+                if ($cached !== null) {
+                    return $cached;
+                }
             }
 
             $result = $this->fetchActivityPub($url, $params, $signed, $validateContentType);
 
-            if ($result !== false) {
-                Cache::put($cacheKey, $result, 14400);
+            if ($result !== false && $result !== null) {
+                Cache::put($cacheKey, $result, 14400);  // Cache successful results for 4 hours
             } else {
-                Cache::put($cacheKey, null, 14400);
+                Cache::put($cacheKey, null, 300);  // Cache failures for only 5 minutes
             }
 
             return $result;