Okay, I tried a few different options with the user identity feature class and finally I was able to get things working for my situation. So here's what I did, I created points in the project area for each of the users and added their names to both text fields. I then removed the associated user domain from each of the fields. Having a domain set for the fields was actually causing me not having the ability to select a value from the drop down menu in MPC within the user identity layer. Once domain was removed, and I reran the caching tool in ArcMap, this allowed the drop down menu to display the different values.Anyhow, in quick summary...
- Created a point for each user and added their name to both text fields
- Removed domain from both text fields