Whenever I check to see who's online on the Xbox, it says my session with LIVE expired and I need to re-authenticate. However if my account isn't authenticated, why can I pull up my Guardian stats? Also, whenever I press the re-authenticate button, I get a popup that disappears almost immediately, it reloads the entire page I was on, but still says my session expired.
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Try clearing the apps cache and/or the content database. https://www.bungie.net/en/Help/Article/13099