After error E102 - Xbox One X won't sync cloud saves to account

The Xbox One automatically saves games to the cloud while you are connected to the internet. Game progress will be saved in the cloud storage of the account currently logged in.

You can read here for more questions about cloud saves, or error troubleshooting:

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Cloud Save FAQ

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Cloud Save Sync Errors

Just to make sue I understand...Are you connected online?

The Xbox One will automatically sync your saves to the cloud unless you're not online...with the latest save.

Per the link below or in your own words....what happened to the save?

support.xbox.com/.../manage-cloud-saves

-Error: “We couldn’t sync your info with the cloud.”

-Error: “Your other Xbox is taking a long time to sync to the cloud.”

-Message: “Which one do you want to use?”

-Error: ”We can’t save additional info for…”

for syncing issues, go to settings> system settings>storage> clear local save game data> this will clear any saves from the hard drive and will have you resync with the cloud. Also you can try playing offline and then while in the middle of the game or right
after it starts going back online.

support.xbox.com/.../cloud-storage-sync-error-messages

Did you visit the troubleshooting article for syncing Xbox One game saves to the cloud error messages yet? Additionally, as an extra
step, can you
remove your profile and re-add it back on your Xbox One? This can sometimes help with cloud syncing issues.

Let us know how it goes!

Try the solutions in this page: Syncing Xbox One game saves to the cloud error messages. They
might help resolve your syncing issues.