Returning Data From API Issue

I am trying to return data from the API, but every time I add a Search against the list by geographical address (within 100 miles of two fixed addresses) the call returns no results, but when I remove this search constraint, all of the results re-appear.

Any ideas about what’s causing this issue?

Is it due to the inability to process the address data fast enough through the API and respond with a list of items?

Just double checking, is the search parameter a string or a geographical address?

@JustinC I’m working on a similar challenge (searching against a list of geographical addresses). Can you add your API syntax?