Wechat changed its nickname and expression, but it didn't respond.

If you can't respond when modifying group nicknames and adding expressions in WeChat, it may be because there are some problems with WeChat. You can try the following methods to solve this problem:

1. Reopen WeChat: Try to log out of WeChat and log in again, and then try to modify the group nickname and add expressions again.

2. Change the group nickname: Try to change it to another group nickname and add an expression to see if it is successful.

3. Clean up the WeChat cache: Find the "Save" option in the setting interface of WeChat application, and then click "Clean up the cache" to try to clean up the WeChat cache.

If these methods can't solve the problem, I suggest you upgrade the WeChat application to the latest version. If you still can't solve it, you can try to contact WeChat official customer service for help.