Caveats: Yes my controller has rumble options and when I plug it in it rumbles. I wanted to make sure neither of those were the issue. I also unplugged it a couple of times after trying to use your plugin and had no effect.
I added the plugin via plugin manager and have it turned on. I currently have no switch assigned yet, once I have this issue figure out I will add a switch and a UI toggle to control the switch but needed to make sure it was working as-is first. I assigned values to each of the Auto Rumbles in the plugin. Save everything and playtest but no rumbling period. I am not sure why there is no rumbling haha