I've had two email notifications about being invited to join two separate groups. If I check my profile there is no notification of such invitations existing. If I check groups there is nothing at all. If I click on the invitation link in the email I get taken to the group, but told it is private and I have to request to join the group. That is fine, and I have done so for one invitation to see what happens. But it seems a bit silly to have no way of responding to an invitation other than by clicking the link in the email and then being refused access and having to request to join. What - if anything - am I misunderstanding/doing wrong?