Might be obvious, but you did Bluetooth pair the dongle with your phone before starting the app?
And per other posts, it is recommended to start only in this order - 1) power the dongle in the port (it's always powered) 2) turn on your car, full drive mode (not acc) and 3) then start the app.
I have increased the font on my android (old eyes) and get a warning on app start to reset the font, otherwise this does cause some data to not show on screen. So, better to reduce the font before starting app.
PS - I am using a generic dongle and Lite, did not get any registry requests