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Trying to set up Firefox Sync and it says my email address is already in use, but won't let me sign in.

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I'm trying to Sync Firefox between my new Android phone with my Macbook Air. It tells me I need to create an account, but says my email address is already in use. So I try to put in the codes in the three boxes, and it leads me back to set up a new account. How can I reset this? How do I proceed?

Thank you for your help!

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