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firefox sync regestration keeps giving me an unknown error when trying to register with my email

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i cannot complete the first step to register for firefox sync, because when i try to enter my email and 'unknown error' pops up, and does not tell me what the error is or what i should do.

i cannot complete the first step to register for firefox sync, because when i try to enter my email and 'unknown error' pops up, and does not tell me what the error is or what i should do.

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Ignore that error message and type your entire email address.