Unfortunately there is no known fix if Microsoft's API fails. Falling back to the registry crawl (which is what happens after the second message) is the only workaround available. You may need to talk to Microsoft Product Support to get help with this problem in the Windows API or your machine's configuration.
(As a hacky workaround, you can also disable the Windows Firewall Service (using Services.msc) while testing. It is the firewall service that blocks Windows Store applications from using the Loopback address.)
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