Why can't my Netease Bubble send short messages? ...

Try re-registering. Popo has set a text message limit, because many of the free messages sent in the past were harassing messages. You need to use a mobile phone now. If you choose the 1 yuan package, the upper limit is 1 1, that is, if no one replies to the message 1 1, you can only re-register and send it again. If someone replies to you, you can send another one, and so on.