Hello,

An email address cannot be used as a recipient value to a task itself. K2 expects a user id value for a task and an email for notification recipients only. So my suggestion is you can execute a smart object method that is connected to your activie directory. Configure the data type of the control in your view to have a filter value of email address which would be used to filter AD, but the value of the datatype stored in the DB should be a user id. Pass that value from the control to a paramter in the workflow and set the parameter as the recipient. That should work ! Let me know how it goes. Cheers