So activating IFFFT is not a requirement for this to work.
I'm no expert but I can say the same thing happened to me with the password because I was using the wrong credentials. Please go login to myQ (directly) to validate youre using the correct information. Then come back to HE and try again. If it still doesn't work, check your logs to see what the issue is. When I installed this initially, I wasn't using the correct credentials. I separated the installation of the app (with no sensor) from the use of the actual tilt/sensor piece to get it all working if that makes sense. I used what was recommended above, ST multi purpose sensor v5. There's a 2 piece magnet. You just put the larger half on the garage doors and in the device page ensure you check the option that says, "using with garage door". Also check that you actually have the momentary buttons with your device page for open and close for each door. Hope this helps. I struggled initially but stuck with it & relied on this unbelievably fantastic community and they pulled me through.