Unable to find/filter out list of Cases by contact names

Summary:

In case management I have created a number of Custom Contact fields in application composer. I used the Dynamic choice list field option and Selected the Contact Object to display 'Names'. The below example shows and example of an Appellant contact field that was created for the case management form

After being published to the environment I am unable to use the names in the custom contact fields to filter out the list of Cases. When I have entered the name in the custom field 'Appellant' :

and I have also defined the contact relationship in the Contact section of the form with other names: