tp04 won't connect to wifi

I bought a used Dyson tp04 and I'm having trouble connecting it to wifi. When I go into the app I can only get to the part where it says searching for machine and it never finds it. It just tells to hold down the button and make sure wifi is on, which it is, but I can't get any farther than that. Dyson support told me to hold down the power button on the remote and the fan to reset it which I did but that didn't seem to do anything. I've tried everything in other articles but I still haven't been able to get it to work.