getDevices failure

I have installed a new garage door opener controlled by the myQ app. I have created a new device called "Garage Door" on the myQ app and am able to control it via my iPhone app. However, the Indigo plugin is unable to detect that device. Here is the Indigo debug log:

Started plugin "MyQ 7.5.3"
MyQ Starting MyQ
MyQ Debug statusFrequency = 600.0
MyQ Debug myqLogin response = {"SecurityToken":"xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx"}
MyQ Debug myqLogin successful
MyQ Warning getDevices failure, status_code = 400

Any idea what I'm doing wrong?

Please read the other recent threads in this forum.