Why apologize? Thanks for your suggestion. You are very kind as the other guys that try to help in the forum.
Yes, I tried to start Fenix app before and one of my combinations is weird: if I start Fenix app before without admin rights, then MSFS with admin rights, I get the aircraft in cold&dark state with the EFB which asks me the passcode perpetually (like it happened to you).
I will try later your last suggestion: starting Fenix app after MSFS is launched.
Thanks.