But the value I want is not being retrieved by the lookup

What happens if the autocomplete lookup does not retrieve the information that I want to enter in that field? Well the answer is that the form user can manually enter data into the field, but they must also enter data into all of the other fields that would have been completed by any associated dynamic lookup (if those fields as defined as mandatory for completion). Here’s an example of a request form designed to allow for that possibility. Note that all of the fields that would have been filled by the associated dynamic lookup have been set to mandatory so that a user manually entering their details will need to provide all of the required information.

As manual entry is possible, if you want to restrict access to your service to just those in your lookup list, for the time being that restriction will have to be applied by restricting access to the URL that brings up the form or via an IP restriction on your RefTracker site.