It turns out there is a switch on the laser module to toggle PWM/TTL. I had checked for one before (as others in the forum had mention it), but it didn't look as I had expected. I've posted a picture below to show what it looks like as it may help someone else at some point.
Also, the switch seems to only work when the laser has power to it. Not 100% sure of this, but I don't want to press it again now that its working correctly