Shoutbox

I recently got a decent webcam, I installed it and got it all working fine, I used Webcam setups on MSN, AIM, yahoo etc, and it was all fine, When I go to invite people to view my webcam on MSN, It shows "Inviting Mr X to view your webcam", then a second after that it says "Mr X Declined your invitation to view webcam", I spoke to the people, and they said they haven't seen the invitation, I've tried 12 times and they've all said they can't see the invitation.
Why isn't my MSN sending out invitations to people, and why can't they see them?
How do I fix this?
Thanks
Richard