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Error message "Your email was just returned. Mistyped email?" is shown on my new PC.

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My new PC is showing the error message "Your email was just returned. Mistyped email?" when inputting the authentication code for Firefox sync login.

When I enter incorrect email/PW info I cannot progress to this stage. When I enter an incorrect authentication code I get a standard error code ("two-step authentication code required").

I recently reactivated an old PC a few days ago and used Firefox sync with that device without issue.

Please help

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