Well, that settles that, eh?
I tossed out the manual for the controller so I don't have the docs but maybe just walking through a basic troubleshooting sequence might help.
If you can't get it working now, good thing is that AC Infinity tech support will be open in 36 hours so you can call tech support (tech support while growing weed - times have changed!).
I've got a tent fan as an entry in the controller app UI and an inline fan on another. When I open the app, the two devices are listed.
If you lose connectivity with the controller, a red band appears across the top of the app. I'm not sure but I think have been times when I've been connected to the tent fan but not to the inline fan (or vice versa). I know that I've had to delete a connection and go to the tent and set up another controller instance for the device. Have you tried that?
At times, I've had to shut off Bluetooth in my iPhone and then start it again. That's worth a try.
Next issue would be to ensure that the plug from the light is connect properly. I'd remove the plug and then plug is back in firmly.
If that's OK, open the controller UI and make sure that you've set the triggers correctly. If everything's set up there, it might be that the next step is tech support.
When I set up the controllers for my fans, the whole process looked very straight forward so if it's not "problem exists between keyboard and chair"
then it just might be an issue with the lead running from the light to the controller.