Can't sign in to xbox app on pc : XboxGamePass - reddit
Sep 09, 2017 · context: xbox app installed, games run like a charm, all is well. run windows decrapifier to clean up some things, xbox app is now broken - anytime i tried to sign in, a window would flash three times for a second, then disappear. not exactly like OP posted, but same core concept i suppose. spent days searching for an answer, couldn't find shit ...
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