Hi! I'm trying to call the people/search endpoint, searching on a custom field. As per the documentation it seems the url below would work for searching for us_citizen=true, but it returns a 500. Suggestions on what I'm doing wrong? Thanks! https://mynation.nationbuilder.com/api/v1/people/search?custom_values=custom_values%5Bus_citizen%5D%3Dtrue&limit=100&access_token=XXX Heather