Since you were not married in 2021 you cannot file a joint return. If you are using an online account, you can use the same email but you need a separate account and user ID for your spouse. With online software you only get one return per fee. If you use the same account you overwrite the first return and lose it forever.
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-start-another-return-in-turbotax-onli...
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