- [ ] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [ ] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

### Environment

* Dubbo version: xxx
* Operating System version: xxx
* Java version: xxx

### Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

### Expected Result

What do you expected from the above steps？

### Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

```
Just put your stack trace here!
```

throw new RpcException("Failed to lookup " + url + " from nacos " + getUrl() + ", cause: " + cause.getMessage(), cause);
        }
    }
    @Override
    public void doRegister(URL url) {
        try{
            String serviceName = getServiceName(url);
            Instance instance = createInstance(url);
            /**
             *  namingService.registerInstance with {@link org.apache.dubbo.registry.support.AbstractRegistry#registryUrl}
             *  default {@link DEFAULT_GROUP}
             *
             * in https://github.com/apache/dubbo/issues/5978
             */
            namingService.registerInstance(serviceName,
                getUrl().getGroup(Constants.DEFAULT_GROUP), instance);
        }catch (Throwable cause){
            throw new RpcException("Failed to register " + url + " to nacos " + getUrl() + ", cause: " + cause.getMessage(), cause);
        }
    }
    @Override
    public void doUnregister(final URL url) {
        try{
            String serviceName = getServiceName(url);
            Instance instance = createInstance(url);
            namingService.deregisterInstance(serviceName,
                getUrl().getGroup(Constants.DEFAULT_GROUP),
                instance.getIp()
                , instance.getPort());
        }catch (Throwable cause){