onChange not firing when Spreadsheet edited by IFTTT

Question

I have a IFTTT trigger set to add a row to a spreadsheet when I send an SMS to IFTTT.

I'm attempting to write a Spreadsheet Google Apps Script to add a corresponding row to an additional sheet in the spreadsheet. It should fire when IFTTT adds a row, but so far it's only firing when I manually change something in the spreadsheet, not when IFTTT does it.

I want basically the same functionality as this question. I used Mogsdad's code from that answer to make a fakeEvent and hand it to an onEdit() function, but I still can't get it to fire automatically.

Is there some special way to implement onChange when the change in question is going be made by a script?

Here's the relevant code:

function createChangeTrigger() {
  var sheet = SpreadsheetApp.getActive();
  ScriptApp.newTrigger("playCatchUp")
   .forSpreadsheet(sheet)
   .onChange()
   .create();
}

// Installable trigger to handle change or timed events
// Something may or may not have changed, but we won't know exactly what
function playCatchUp(e) {
  // Check why we've been called
  if (!e)
    Logger.log("playCatchUp called without Event");
  else {
    if (e.hasOwnProperty("changeType")) {
      Logger.log(e.changeType);
    }    
  }

  // Build a fake event to pass to onEdit()
  var fakeEvent = {};
  fakeEvent.source = SpreadsheetApp.getActiveSpreadsheet();
  var lastRow = fakeEvent.source.getActiveSheet().getLastRow();
  fakeEvent.range = fakeEvent.source.getActiveSheet().getRange(lastRow, 1, 1, 3);
  Logger.log(fakeEvent.range.getRow());
  changeIt(fakeEvent);
}

I changed the onEdit() call at the end to changeIt() so that I would know that it was the onChange trigger firing, not the onEdit. I also took out the stuff that dealt with simultaneous events, because I don't anticipate any.

Like I said, this script works great when editing the sheet myself, but not after an IFTTT change. Any ideas? Thanks!