Anytime you see can’t sync data/ try again or use offline It is recommended to only click try again. Sometimes multiple attempts will work.
It is recommended to never sync off-line data.
Additionally if you ever see it’s taking too long to get your save data In relation to being tied up by your other console (or pc ), Never synced to the last known save data.
This is a general recommendation for everything not just KI.
The issue is that if your save game is in a bad state let’s say it’s not fully uploaded your local save may not be valid anymore.
Anyway no matter what game I’m playing if I see something about save data not syncing or use last save, I hard quit out of my Xbox or my Win10 game every time.
Most of the time it’s a service interruption abd your save will start working as normal at some point but unfortunately if you’ve clicked off line or last data there is a good chance your save is affected.
That said, I will work through looking at if anything can be recovered (we have helped people before). We will work through this on direct messages.