Hi, We had our plugins registered in Sandbox mode (for development we were using on premise and were deploying it on online environment) and the Microsoft Dynamics CRM Sandbox Processing Service was not running. Starting the service resolved the issue. Hope it helps. Discover more from Nishant Rana's Weblog Subscribe to get the latest posts … Continue reading The plug-in execution failed because no Sandbox Hosts are currently available. Please check that you have a Sandbox server configured and that it is running.