Hi,
Do the following create a local account start the Microsoft store do not log in with a microsoft account with the local account start the microsoft store > download > get updates.
Wait for it to finish and see if there are any errors.
To create a local account > Start menu > settings > accounts > other accounts > select the option I don't have this person's sign-in information > If you want to create a local account, select the option Add a user without a Microsoft account.
Thanks