A syndicated webinar will not be active in either channels until both channel owners approve it. You can deny approval during the initial syndication request or withdraw it at any time in the future.
If syndication is waiting for approval, you'll see the word 'approve' in red.
If you have approved and you are waiting for the other channel owner to approve, in IN / OUT will be grey.
If both channels have approved and the syndication is active, the IN / OUT will be green.
You can withdraw at any time by clicking on IN/ OUT > Syndication > Withdraw approval.