That accounts link is specifically referring the Destiny Game Content through the mobile app. Wait until the tomorrow when the beta goes live again and give it a refresh!
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I have this issue as well. I have been playing since the start of the Xbox One beta and it says I have no accounts linked. "No Accounts Found. be sure your account is linked on Bungie.net." "tap to try again"
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Verify that the correct account is linked to your bungie.net user profile though your [url=http://www.bungie.net/en/User/Edit]Settings[/url] then Account Settings. You MUST be on the same account as you're playing Destiny on. Otherwise, you may be accumulating stats, but under a different bungie.net user profile.