JSON API interaction doesn't send API request to inputted URL

We made a simple test bot to try out a JSON API interaction. (The bot ID is 55426.) In the second interaction, we used our API endpoint https://epluribus.io/unumbackendsnatchbot, which has a valid response on Postman. We copied this response from a weather example in the documentation (http://api.openweathermap.org/data/2.5/weather?q=London&units=metric&APPID=3dd56b9c2b2dc702d326f13bc0859ca7). However, the request is not being made -- we verified this by checking the console logs. We can't figure out what we're missing. Can you help??