If you ignored the group, it moves to your "Spam" or "Archive" folder, and you won't get notifications.
Note: Once unblocked, you will start receiving their messages in the group chat again. how do i unblock a group chat
You cannot "unblock" or rejoin automatically. You must ask a friend in the group to add you back. If you ignored the group, it moves to
Long-press the group you want to unblock, tap the three dots (menu), and select . Scroll down to Chat lock and toggle it Off . If you ignored the group