diff --git a/packages/common/src/sdk.ts b/packages/common/src/sdk.ts
index 481060f..544dbc5 100644
--- a/packages/common/src/sdk.ts
+++ b/packages/common/src/sdk.ts
@@ -5,10 +5,14 @@ import { decryptConfigFile } from './configCrypto'
 
 let _initPromise: Promise<void> | null = null
 let _initResolve: (() => void) | null = null
+let _initReject: ((e: unknown) => void) | null = null
 
 function ensureInitPromise(): Promise<void> {
   if (!_initPromise) {
-    _initPromise = new Promise((resolve) => { _initResolve = resolve })
+    _initPromise = new Promise((resolve, reject) => {
+      _initResolve = resolve
+      _initReject = reject
+    })
   }
   return _initPromise
 }
@@ -17,9 +21,19 @@ function markInitialized(): void {
   if (_initResolve) {
     _initResolve()
     _initResolve = null
+    _initReject = null
   }
 }
 
+function markInitializationFailed(e: unknown): void {
+  const reject = _initReject
+  // Reset so a retry can call initialize() again
+  _initPromise = null
+  _initResolve = null
+  _initReject = null
+  reject?.(e)
+}
+
 export const XuqmSDK = {
   /**
    * @param options.appKey    - Your application key (from the tenant platform)
@@ -27,6 +41,7 @@ export const XuqmSDK = {
    */
   async initialize(options: XuqmInitOptions): Promise<void> {
     if (isInitialized()) return
+    ensureInitPromise()
     const configUrl = `${DEFAULT_TENANT_PLATFORM_URL}/api/sdk/config?appKey=${options.appKey}`
     try {
       const res = await fetch(configUrl)
@@ -41,20 +56,11 @@ export const XuqmSDK = {
         baseUrl: remote.imApiUrl ?? DEFAULT_TENANT_PLATFORM_URL,
         debug: options.debug,
       })
+      markInitialized()
     } catch (e) {
-      // Fallback: construct URLs from the built-in platform endpoint
-      initConfigFromRemote(options, {
-        imWsUrl:        DEFAULT_IM_WS_URL,
-        fileServiceUrl: DEFAULT_TENANT_PLATFORM_URL,
-        apiUrl:         DEFAULT_TENANT_PLATFORM_URL,
-      })
-      configureHttp({
-        baseUrl: DEFAULT_TENANT_PLATFORM_URL,
-        debug: options.debug,
-      })
-      if (options.debug) console.warn('[XuqmSDK] Config fetch failed, using fallback URLs', e)
+      markInitializationFailed(e)
+      throw e
     }
-    markInitialized()
   },
 
   /**