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#1
Hello ActualSquid, and welcome to Ten Forums. :)
You are getting this message since you are signed in to the built-in elevated "Administrator" account. Windows apps cannot run in an elevated account like this one.
You'll need to sign in to your Microsoft account on the computer, or sign in to a local account on the computer and have its Store signed in with your Microsoft account.
If you have any questions about this, then please let us know.