No plugins have been selected from the list. Please select at least one and try again error while trying to register Custom Workflow Activity in CRM 2013 Online.

Hi,

Update – Check if the class used for defining Plugin / Workflow Activitiy is PUBLIC

Was getting below error while trying to register Custom Workflow Activity in CRM 2013 Online.

The solution we found out was to use CRM 2015’s Plugin Registration Tool to register it.

Hope it helps.