League's Manager has created a match in WCM, but this match doesn't appear in InPlayer under section Assets, also the InPlayer field is empty in the list of Matches in WCM > Control Panel.

Log in to WCM, go to Competition Manager -> select a season -> competition, find a respective match, click on InPlayer icon -> "Manage Match from InPlayer" form will appear. 

Activate one of two option and click Update this Asset.