Why does qq display sending failure when it joins the group?

Because your IP operation is too frequent!

(a) a QQ can only add about 20 groups a day;

(2) A QQ group actually occupies the position of friends. According to QQ level and membership, each QQ has a maximum number of friends. QQ can add group number = maximum number of friends-number of friends;

(3) There is a limit to sending group joining requests from the same ip every day. The speed is too fast, and there are too many groups. Even if you change QQ to join the group and send it successfully, there is still no response.

(d) Group addition restrictions are determined by ip and QQ numbers. If an ip is sent too much, it will link to the QQ number that blocks this ip login, and this ip will be blocked because a QQ number is sent too much.

(5) Frequently used and high-level QQ is easy to join the group, otherwise, using the following QQ is easy to be restricted:

(1) QQ, which is rarely used, low-grade or junk, is easy to be restricted (such as prompting to join the group frequently or maintaining the server).

(2) If a computer uses more than one QQ, it will use dozens or hundreds of QQ a day.

(3) New QQ, just applied for.