Yahoo conference problem


I am trying to create a yahoo conferece. I am adding 2 users say A and B from my logged in user.

So it works in the below scenario.

Invite A and than Invite B. A accepts and than B accepts.

But in the below scenario it does not work. Does not works means B cant see A in the conference and A cant see B in the cinference. But my user can see both A and B in the conference and can send/receive message to both A and B.

Invite A and than B. B accepts first and than A accepts.

Can anyone suggest me what I am doing wrong.