IFTTT Applet receiving 422 from instance

Hi folks. I’m trying to bring in a news feed from Twitter using an IFTTT applet.
I’ve made an application, gotten the access key, brought that to IFTTT and created an applet, but when it runs I get

Unable to make web request. Your server returned a 422

I can’t find any additional documentation on making these apps, so I’m hoping someone’s seen something similar. Thanks!