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.

userprofile\AppData\Local\Packages\Microsoft.XboxIdentityProvider_cw5n1h2txyewy\AC\TokenBroker

Where do I find this? I searched my computer and can't find it. it it in Xbox?

You need to use Windows File Explorer. Make sure that you select to show Hidden Items. Start by clicking on your C: drive. Then you should see the path as described in the fix.

Replace "userprofile" with your username and note that the random numbers and letters in the "Microsoft.XboxIdentityProvider_cw5n1h2txyewy" may be different. Just select the only folder that starts with "Microsoft.XboxIdentityProvider_" and you should be OK.

After implementing this fix and playing Sudoku for awhile, it seems that Sudoku no longer saves a game in progress. Previously, I could start a game, then click the Back arrow to go back to the Home Screen and exit the program. Then, when I restarted Sudoku it would let me rejoin the game I was playing and remember my progress in that game. That doesn't work any more after this fix. But, at least the fix did let Sudoku remember my Level so that is something.

userprofile\AppData\Local\Packages\Microsoft.XboxIdentityProvider_cw5n1h2txyewy\AC\TokenBroker

Where do I find this? I searched my computer and can't find it. it it in Xbox?

The app is still not working on my computer. I can't sign into Sudoko - still says I am a guest. But I can sign in on my iPhone with my Xbox account. On my computer, I can sign on to Solitare and Mahjong. I have tried restarting my computer on several different days, deleting the app, and re-installing it. This has been going on since the last few days of January. Very frustrating.

Worked for me too!