Send SMS when inviting others to join the group.

See if there are any settings in the group. Some invitations can only be sent after the group owner agrees to join the group. If it is not set, you can directly if. There are two kinds of joining. 1 means that someone else pulls you into the group, and you can join the group directly without permission. Whether it is a group owner or a team member, you must get your consent to join. I hope it helps you.