外部系统联登-注册用户失败no_matching_function_for_path /externalRegister"

我的小程序嵌入uni-im；需要在服务端打通与uni-id的用户系统 。当前按照文档【 //https://doc.dcloud.net.cn/uniCloud/uni-id/cloud-object.html#external】的步骤进行配置
调试的报错：
{"success":false,"error":{"code":"InternalBizError","message":"no_matching_function_for_path /uni-id-co/externalRegister"}}
根据文档找不到解决方案：

访问链接是：https://fc-mp-ee363348-a386-41c7-8812-xxxxxxxx.next.bspapp.com/uni-id-co/externalRegister
我在小程序端：的cloudfunctions/common/uni-config-center/uni-id/config.json文件里
已经配置了 "requestAuthSecret": "", // URL化请求鉴权签名密钥
以下是我的java端代码

 //外部系统联调-注册  
        //小程序端：已经在 cloudfunctions/common/uni-config-center/uni-id/config.json 配置requestAuthSecret 并上传云空间  
        String requestAuthSecret="qwertyuiop111asdzxcqwertyuiop111asdzxc";  
        String url = "https://fc-mp-ee363348-a386-41c7-8812-xxxxxxxx.next.bspapp.com/uni-id-co/externalRegister";  
        Map<String,Object> params = new HashMap<>();  
        params.put("externalUid","ab1234");  
        params.put("nickname","测试1");  
        params.put("username","ab1234");  
        params.put("avatar","https://d187uamsy6q6zw.cloudfront.net/2020/03/27/312bbb3f-7231-4083-8ed4-d941e814e3cd.jpg");  
        params.put("gender", 0);  
        Map<String,String> info = new HashMap<>();  
        info.put("uniPlatform", "web");  
        info.put("appId", "__UNI__A7315951");  
        Map<String,Object> data = new HashMap<>();  
        data.put("params",params);  
        data.put("clientInfo",info);  
        String nonce= RandomUtil.randomString(15);  
        long timestamp = System.currentTimeMillis();  
        Map<String,String> headers=new HashMap<>(3);  
        headers.put(UniConstant.HEADER_NONCE, nonce);  
        headers.put(UniConstant.HEADER_TIMESTAMP,String.valueOf(timestamp));  
        data.put("params",info);  
        data.put("uniIdToken","");  
        String signature = UniUtil.getSignature(params, nonce, timestamp, requestAuthSecret);  
        headers.put(UniConstant.HEADER_SIGNATURE,signature);  
        HttpRequest post = HttpUtil.createPost(url);  
        HttpResponse response = post.addHeaders(headers).body(JSONUtil.toJsonStr(data)).execute();  
        System.out.println(response.body());  
        //打印的还是 {"success":false,"error":{"code":"InternalBizError","message":"no_matching_function_for_path /uni-id-co/externalRegister"}}