diff --git a/ruoyi-oa/src/main/java/com/ruoyi/oa/im/ImCredentialsController.java b/ruoyi-oa/src/main/java/com/ruoyi/oa/im/ImCredentialsController.java
index 5b0da4a..5d5d157 100644
--- a/ruoyi-oa/src/main/java/com/ruoyi/oa/im/ImCredentialsController.java
+++ b/ruoyi-oa/src/main/java/com/ruoyi/oa/im/ImCredentialsController.java
@@ -2,19 +2,25 @@ package com.ruoyi.oa.im;
 
 import com.ruoyi.common.core.controller.BaseController;
 import com.ruoyi.common.core.domain.R;
+import com.ruoyi.common.core.domain.entity.SysUser;
 import com.ruoyi.common.helper.LoginHelper;
 import com.ruoyi.oa.im.mapper.ImBindMapper;
+import com.ruoyi.system.mapper.SysUserMapper;
 import lombok.RequiredArgsConstructor;
+import lombok.extern.slf4j.Slf4j;
 import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import java.util.HashMap;
 import java.util.Map;
 
 /**
- * 当前用户的 IM 凭据（供 Web SDK 登录）
+ * 当前用户的 IM 凭据。
+ * 没有绑定时自动给当前 OA 用户注册一个 IM 账号（imUserId = "oa_{userId}"），手机号不再是必须。
  */
+@Slf4j
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/system/user/im")
@@ -23,17 +29,30 @@ public class ImCredentialsController extends BaseController {
     private final ImBindMapper bindMapper;
     private final OpenImClient openImClient;
     private final OpenImProperties props;
+    private final SysUserMapper userMapper;
 
-    /** 当前用户 IM 登录所需信息：imUserId + token + apiUrl + wsUrl */
+    /**
+     * 获取当前用户 IM 登录所需信息。
+     * @param platformId 1=iOS 2=Android 3=Windows 4=OSX 5=Web；默认 5
+     */
     @GetMapping("/credentials")
-    public R<Map<String, Object>> credentials() {
+    public R<Map<String, Object>> credentials(
+            @RequestParam(value = "platformId", required = false, defaultValue = "5") int platformId) {
         Long userId = LoginHelper.getUserId();
-        ImBind bind = bindMapper.selectById(userId);
-        if (bind == null || bind.getImUserId() == null) {
-            return R.fail("当前账号未绑定 IM");
+        if (userId == null) {
+            return R.fail("未登录");
         }
-        // platformId=5: Web
-        String token = openImClient.issueUserToken(bind.getImUserId(), 5);
+
+        ImBind bind = bindMapper.selectById(userId);
+        if (bind == null || bind.getImUserId() == null || bind.getImUserId().isEmpty()) {
+            // 自动注册：不再要求手机号
+            bind = ensureBind(userId);
+            if (bind == null) {
+                return R.fail("IM 账号注册失败");
+            }
+        }
+
+        String token = openImClient.issueUserToken(bind.getImUserId(), platformId);
         if (token == null) {
             return R.fail("获取 IM token 失败");
         }
@@ -44,4 +63,29 @@ public class ImCredentialsController extends BaseController {
         data.put("wsUrl", props.getWsUrl());
         return R.ok(data);
     }
+
+    /** 给指定 OA userId 在 OpenIM 主 API 直接注册一个账号并落 bind 表 */
+    private ImBind ensureBind(Long oaUserId) {
+        SysUser u = userMapper.selectById(oaUserId);
+        if (u == null) return null;
+        String nickname = u.getNickName() != null && !u.getNickName().isEmpty()
+            ? u.getNickName()
+            : (u.getUserName() != null ? u.getUserName() : ("user" + oaUserId));
+        String imUserId = "oa_" + oaUserId;
+
+        boolean ok = openImClient.registerImUserDirect(imUserId, nickname);
+        if (!ok) {
+            log.warn("[IM] registerImUserDirect failed for OA user {}", oaUserId);
+            return null;
+        }
+
+        ImBind bind = new ImBind();
+        bind.setUserId(oaUserId);
+        bind.setPhone(u.getPhonenumber());
+        bind.setImUserId(imUserId);
+        bind.setBindStatus(1);
+        bindMapper.insert(bind);
+        log.info("[IM] auto-bound OA {} -> IM {}", oaUserId, imUserId);
+        return bind;
+    }
 }
diff --git a/ruoyi-oa/src/main/java/com/ruoyi/oa/im/OpenImClient.java b/ruoyi-oa/src/main/java/com/ruoyi/oa/im/OpenImClient.java
index dddbae0..f9d6a44 100644
--- a/ruoyi-oa/src/main/java/com/ruoyi/oa/im/OpenImClient.java
+++ b/ruoyi-oa/src/main/java/com/ruoyi/oa/im/OpenImClient.java
@@ -205,6 +205,39 @@ public class OpenImClient {
         return null;
     }
 
+    /**
+     * 直接在 OpenIM 主 API 注册账号（无需手机号、无需 chat 层）。
+     * 用于给 OA 内部账号（如 admin / 后台账号）建立 IM 账号。
+     *
+     * @param imUserId 业务侧自定义的 IM userID（建议格式 "oa_{oaUserId}"）
+     * @param nickname 昵称
+     * @return true 注册成功或已存在；false 失败
+     */
+    public boolean registerImUserDirect(String imUserId, String nickname) {
+        if (!props.isEnabled()) { return false; }
+        Map<String, Object> user = new HashMap<>();
+        user.put("userID", imUserId);
+        user.put("nickname", nickname == null || nickname.isEmpty() ? imUserId : nickname);
+        user.put("faceURL", "");
+
+        Map<String, Object> body = new HashMap<>();
+        body.put("secret", props.getSecret());
+        body.put("users", java.util.Collections.singletonList(user));
+
+        JSONObject resp = postJson(props.getApiUrl() + "/user/user_register", body, getAdminToken());
+        Integer errCode = resp.getInteger("errCode");
+        if (errCode != null && errCode == 0) {
+            return true;
+        }
+        // 已存在通常 errCode 1102 或 20004，视为成功
+        if (errCode != null && (errCode == 1102 || errCode == 20004)) {
+            log.debug("[OpenIM] imUser {} already exists, ok", imUserId);
+            return true;
+        }
+        log.warn("[OpenIM] registerImUserDirect failed for {}: {}", imUserId, resp);
+        return false;
+    }
+
     private static String md5(String text) {
         try {
             MessageDigest md = MessageDigest.getInstance("MD5");