Nope, nothing else to do with the Fidesmo app. It just facilitates the installation of the applet on the Flex.
I would assume the keycard is in the same location as the MY. Near the cup holder area. If so, yeah just put your arm there. I found the internal reader was much easier to trigger. If it’s a new install of the flex, any swelling may inhibit communication until it subsides. If it’s been a bit, I would not anticipate any trouble scanning.
This topic may be helpful too. We talk about the reader and some intricacies with its use. Orientation of Apex Flex?
Congrats on the 3. I will never go back to an ICE unless they pry my Tesla out of my hands. Haha