diff --git a/src/bootstrap.ts b/src/bootstrap.ts
index 088786a..d318f5f 100644
--- a/src/bootstrap.ts
+++ b/src/bootstrap.ts
@@ -208,7 +208,9 @@ export async function bootstrap(config: Config, logger: Logger): Promise<AppCont
         const chunk = ids.slice(i, i + 100).join(',');
         try {
           const res = await fetchWithTimeout(
-            `https://api.reddit.com/api/user_data_by_account_ids?ids=${encodeURIComponent(chunk)}`,
+            // www.reddit.com serves this unauthenticated; the api.reddit.com
+            // host 404s the same path without an OAuth token.
+            `https://www.reddit.com/api/user_data_by_account_ids.json?ids=${encodeURIComponent(chunk)}`,
             { headers: { 'User-Agent': config.reddit.userAgent }, timeoutMs: 15_000 },
           );
           if (!res.ok) {
diff --git a/src/services/chat/service.ts b/src/services/chat/service.ts
index 75501f6..a312a54 100644
--- a/src/services/chat/service.ts
+++ b/src/services/chat/service.ts
@@ -1066,7 +1066,8 @@ export class ChatService {
       }
     }
 
-    // Pass 3 — for every chat still on a raw t2 ID, call the resolver.
+    // Pass 3 — for every chat still on a raw t2 ID, batch-resolve via the
+    // injected resolver (www.reddit.com/api/user_data_by_account_ids.json).
     const needed: string[] = [];
     for (const chat of this.cache.get()) {
       const t2 = this.extractT2(chat);
@@ -1078,6 +1079,7 @@ export class ChatService {
         let updated = 0;
         for (const [t2, name] of Object.entries(got)) {
           const bare = t2.replace(/^t2_/, '');
+          if (!name) continue;
           this.t2ToUsername.set(bare, name);
           this.persistUsername(t2, name);
           for (const chat of this.cache.get()) {