How can I activate my iphone although the previous apple id is mine?

I bought an iphone 5 on amazon and used it for nearly 2 month. But it isnt fit with my company, so I sold it to my friend. He restored it and it needed my apple id to activated. But when I typed in, it said my apple id couldnt used to activated this phone, although I was the one who set up it first.

I am having a similar problem.  I am beginning to wonder if there is something wrong with apple authentication right now.

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