The issue appears to be that you're not signed in to your Adobe ID. In the dialog box you posted, it says "Signed In As: Not Signed In"
Go to the Help menu and sign in with your Adobe ID.
Sync Settings only works to sync between two computers which are both signed into the same Adobe ID.
I'm already signed in
That's why i'm so confused.
I'd reboot your computer, log out from Adobe ID, and log in again.
It wouldn't hurt to restore your InDesign prefererences if that doesn't work.
i logged out and logged in of my adobe id and restarted the application.
that seemed to work.