add users to og group via vbo doesn't work: record is deleted immediately
You might need to grant a OG role to the new member after adding them.

e.g. og_role_grant('node', $node_page-&gt;nid, $account-&gt;uid, 2);

The magic number on the end determines the type of role granted. 1 = non-member, 2 = member, 3 = administrator member