I know there are a number of threads on this one, but none of them (including a full uninstall and reinstall (and deleting all cached files) fixed it for me. However, this post appears to have worked for me (I can’t confirm 100% as it’s 45GB in to a 128GB update from 1.19.9.0 to the newest patch level) - I made a backup of my credentials, then deleted all credentials which started with xbl_ started MSFS again, and it didn’t even ask me to log in to the Xbox app again.
Coding/design analogy for the “Press any key to continue” logic…
300 mile one way road with no turnaround and no exits. 30 miles in you’re stopped at a toll booth and asked if you want to continue your journey. No matter your answer, you’re committed to continue the rest of the 270 miles. But you’re stopped until you answer… any answer. 
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