How SoT saves progress after changing account in microsoft store?

saves it to the cloud and to your account with rare .

Okay, but on what factor does it recognises progress. Is it connected to win10 user account? If it is, how does it perform on using another pc? Its totally different account on different email.

If it's the game that needs updated, this is how to do that:

https://support.microsoft.com/en-us/help/4026259/microsoft-store-check-updates-for-apps-and-games

After trying the suggested fixes, you can always try to uninstall the game and reinstall it. I don't know how game progress is saved, though, so be careful not to delete your game progress.

Your progress is stored on the cloud as long as you are signed in with a Microsoft account, Christine.

So it could be a problem with your current cloud save, just to give an example.

Hello, Nicholas S. I’m Arturo, and I’ll be glad to provide assistance with your inquiry today.

Depending on the game, doing that will represent issues with the saved data because some games upload the progress to the cloud.

So, your best option would be logged with your account on the Microsoft Store.
Then, on your friend’s PC enable offline permission via Microsoft Store settings and once your friend download the titles they want, he can change the account on the Xbox app (your account needs to be logged in the Microsoft Store).

Thanks for your attention,

Arturo.