422 error from makeWebRequest

A user is reporting a 422 error from makeWebRequest.

  • Device Name: Edge 1030 Plus
  • Firmware Version: 2.30

The app works fine on a real 1030.

I've gotten the 402 error, which is listed below. But 422 isn't.

https://developer.garmin.com/downloads/connect-iq/monkey-c/doc/toybox/Communications.html

Does anybody have any idea what 422 might mean?