Do you mean that you and your spouse filed a joint tax return---using his account? If that is what happened then you know that you filed your 2023 tax return. Your "old" account is simply generating reminders----TurboTax accounts do not "know" about each other, so your old account does not know that you filed a joint return using a different account. If your joint return was filed and accepted, just ignore the emails from the old account.
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