I never received the code to complete sign in. Tried 5 times. Email account did not receive email with code. Firefox says their code emails were returned. The account firstname.lastname@example.org is a valid email account. What is the problem???????? This code is new. I had no problem syncing with another new computer three months ago. It did not ask for a code last time.
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Shut down the old sync. Then create a new account.
Delete Account: Look for Delete Account at the bottom of https://accounts.firefox.com/settings