It will be all right after a while.
There are many factors that cause this problem, such as network speed, QQ version, or Tencent server.
You can't send it out because your network is not good, or you have exceeded the number of words. You can change the time period, post online, or reduce the number of words.
You can try sending it to alumni or Weibo by checking the space. The total number of points should not be large. It should be that your daily settings are wrong. If it is a server problem, you can clean up the data of your previous heart-to-heart talks (including alumni heart-to-heart talks) and try again in 3 days. If not, contact Tencent customer service. I hope it can be adopted!
The QQ network type in the settings does not match the network type of the machine (rarely).