Hello Chris,
Sorry, I missed your post here. I did have this question posed to me last month in this post. In work orders, you are not choosing a contact to assign the work order to (that's for plain activities). You actually select an Entity. You need to put in the Entity's phone number (Phone field) and name (the field FullName will give you the name of the main contact for the company.) into the Activity table. Then it will be available for the report.
Let me know if you need any more help.
Greg