1, if you are on a mobile phone, most of the time it is because of network problems, followed by the mobile phone itself. You can check the software or memory, or click the avatar and then click Settings. There will be some permissions problems and you can adjust them yourself. If none of the above is true, then the other party should keep some things on their QQ secret and hide them. This is a very normal situation.
2. It may be a network problem or a software problem. If deleted, please download or upgrade again.
If you fail, you should try again several times. If it still doesn't work, if no one answers, you can call customer service, otherwise this rule cannot be changed.