Rare aware and fixing Sea of Thieves closed beta authentication issue

I have been happily bobbing along on the foaming waves of the Sea of Thieves closed beta, which is scheduled to end tomorrow, but was told this morning I couldn't log in.

"Sorry," the game said, "but you are not authorised to play Sea of Thieves right now."

There were three possible reasons why: "We're not currently running a live Sea of Thieves play session; Your Gamertag has not been authorised to participate in the Sea of Thieves Technical Alpha; There is currently another non-authorised Gamertag signed in. (Kiwibeard)."

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