Hi!
first of all, thank you so much for helping me to sort it out!
In my security account (like your picture) I have the right number, because I could delete the incorrect one.
The "bad number" is still staying in the "Devises".
My fears, after getting a warning message from Apple, "the Number xxx will no more be used after 2 weeks, it is not your devise Nr." (or something like this but "more English")
But..xxx is the correct number! And of course I have fears, not just that Apple Pay will be affected if the 2FA will go to Nirvana and all other activities that need an authentication.
Do you have a clue what can happen if I cannot change the Iphone Nr. In the "Devises"?
Thanks again