Description :
If you have allocated any resources as unlimited or greater than your reseller account resource,then your domain will not sync with the plan. You need to allocate the resources for all your domains within the resources allocated to your whole reseller account.
Required Information :
Your Plesk Control Panel user name and password.
Procedure :
[1] Access your control panel at https://www.yourdomain.com:8443 [ Example :https://www.servername:8443 ]
[2] Click on subscriptions.
[3] Click on the subscription name.
[4] Click on sync option.
This will list the parameters which you need to reduce in your plan or service plan. Change the same in your plan and again click on sync.