To join a group
You must be invited into a group. Anyone who is a member of the group can add you to the group from the app, or they can send you a share link.
Note: If the group admin has enabled Request to join, you might need to request access to the group.
To rejoin a group
If you left the group and want to rejoin:
Select the Open Navigation menu.
Select the Archive button.
Select the Chats You Left tab.
Select the group you left, then select Rejoin (Rejoin Group on Desktop) to be added back to that group.
Important: If you were removed from the group, only users within the group can add you back in.
For more help, contact support.