Hi Guys,
Surprised that I got it working OK today. IT saved the progress for 5 days. I closed the game and reopened and did all 5 days separately. here is whatt I did.
YOu should have indtalled xbox and Sudoku and logged into xbox and microsoft store with same userid.
Then open microsoft store. Search for Microsoft sudoku.
It may show 'Play' button. Wait for 2 mins. Check the version you have. IF it is not 2.9.50xx, an 'Update' button will appear.
Click on update and let the update progress.
Once it is over, you are ready to play.
Ensur ethe version is 2.9.5081