"Steam Authentication FAILED"

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    I bought Defcon a month or two after it was released, and it was smooth sailing for all the games I’ve played on it. But ever since last week [or two weeks ago] when i re downloaded for some nuclear fun. it comes up with AUTHENTICATING and after a minute i get Steam Authentication FAILED. Ive tried all the things thats said for this kind of thing but nothing works. Can anyone help?

    Please help

    I didn’t find the right solution from the internet.



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