I've also seen at least two references to cleaning up Microsoft Accounts as fixing the issue.
This describes something very similar to your issue (same error code) - none of the prescribed actions worked,
answers.microsoft.com/en-us/windows/forum/all/windows-store-does-not-open/95fc55f7-aa9e-4be5-aaa6-929b6f8115a2?page=3
BUT
The last post on page 3 describes an issue that was on another post somewhere, with a conflict in User Accounts being resolved before the thing worked again.
Might be worth looking whether you've got several accounts.
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