As WildTapestry269 posted above you should see a plane on the Garmin screen.
I’m not a RL pilot just a long term simer but I can’t recall ever seeing this before.
If you have any mods at all installed (ie any non Garmin mods) in the Community Folder then it might be worth a shot temporarily uninstalling these (I use addon linker so that would be a quick test for me) to see if it makes any difference.
Out of interest have you got the Garmin mod installed which is in FS20 content screen?