SOLUTION POSSIBLY FOUND:
Go to your Ableton midi control settings and enable "show link toggle." Then, in the top left of your screen, and click the link button; make sure the link button (next to your tempo and tap button) is orange (enabled). This fixed the issue for me. This was not shown in the tutorial, as I assume the link is enabled by default, however I (I assume, like many others) accidentally disabled it when I first got Ableton and was messing around with it.