If you are unable to sync the contents, there may be a connection issue.   

To verify if the admin is sync with the player, there is a JSON API in vSignage.

1. First make sure your windows firewall setting has allow vSigange to access.

2. Please use this API to check if source player see any other players and campaign.

Open the Chrome browser and key in the player IP to see some log display on the webpage.

    http://{Source player IP}:6060/v1/devices

   for example

You will get a JSON file and see all devices this player see.

“planID” shows the campaign player play and the modify time.