Fiddler's Root certificate is installed on the phone. Fiddle is not complaining about client certificate, as it sometimes does. Turning proxy off for the WiFi connection brings everything back to normal.
Browsing the store works over a proxy, but the actual app download process (or possibly the license check process, or maybe both) is certificate-pinned. You can't MitM it without Microsoft's cert. (This has been known for months, if you read the threads about using a proxy with the store they all say you have to turn it off before hitting Install).
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