Ok, I found what changed here.
On my Xbox that I only have the sim installed on and the one that I fly 99% of the time on, I had “World - offline mode” installed.
On my other Xbox, I had uninstalled “World - offline mode”, thinking I didn’t need it, at all. This Xbox is the one that had those two options greyed out.
I just reinstalled “World - offline mode” and launched the sim. Now both options are no longer greyed out.
For the uninitiated, “World - offline mode” is found by:
• Xbox Home
• Highlight Microsoft Flight Simulator
• Press Menu button on controller
• Manage game and add-ons
• Select Microsoft Flight Simulator
• Press A
• Manage installation (on storage card or internal wherever you have the sim installed)
From here, “World - offline mode” will either be installed (checkbox ticked) or uninstalled (checkbox unticked).
To install, simply tick the box and choose “Save Changes” on the right.
Once it’s installed launch the sim and see if the options are no longer greyed out.