Microsoft Sudoku has once again lost my progress on daily challenges. Please advise when this issue will be fixed and my progress will be restored.

I think I've found the answer as follows:

Having tried the proposed solutions as above, I went for a "last ditch, last chance" solution before ditching SuDoku for good.

So I deleted the SuDoku App AND .... having wiped the 'Identity Provider' folders referred to above, I also deleted XBox.

I then re-downloaded and installed MS SuDoku from the Microsoft Store.

I DID NOT and HAVE NOT reinstalled XBox.

And SuDoku is now working perfectly, and has been doing so for the past few days.

Since then, I have NEVER received any notifications that I am offline.

Seems to me that rather than the SuDoku App, the problem lies with XBox

I tried these steps and it made no difference.....

Solved!

Complete the following steps:

• Open the File Explorer and paste the following into the address bar to go to a specific location on your computer:
• %userprofile%\AppData\Local\Packages\Microsoft.XboxIdentityProvider_8wekyb3d8bbwe\AC\TokenBroker
• Delete any accounts and cache folders that you can see at this location.
• Launch the Xbox App and sign in to your account again.
• Launch Microsoft Sudoku and you're in

Same for me... tried this too, but no luck..
Still losing progress when closing the sudoku window

I tried this and no fix. As much as I am sad for all of us who are having this problem I feel better that it is not just me. My husband is a programmer and followed the fix instructions exactly, it didn't solve the problem and he has no other suggestions. Has anyone tried anything different?