I am trying to user GrantItemsToUser Server API to add items to player's inventory. The API works fine in the UNITY Editor but when I make a facebook WEB GL build from UNITY and call GrantItemsToUser it gives an error "/Server/GrantItemsToUser: Missing or invalid X-SecretKey HTTP header". Developer Secret Key is added in the PlayfabSharedSettings and I am using "CustomHTTP" as request type. What could be the issue?