There are groups that only want to choose members. It says status under the group name of "Public" or "Private." They have to go into Admin in their group menu and accept any pending members.
I don't know if they do it on purpose or accident. Sometimes they come back in a few days and accept the new applicants.
Late to the party and thrilled to be a Bonus Winner! How fun! What fabulously creative sets -- and what a challenge! That is some real colorful art and very interesting to work with. A challenge for sure! And a fun one!