I created a new email for this because I couldn’t remember my old one until now so now I have duplicate social security numbers how do I delete the newer account

[LeonardS]

You can not deactivate or remove your TurboTax account.  However, if you wish to abandon your TurboTax Account then you can delete all your data using the Clear & Start Over function.

This link to the TurboTax help page How do I clear and start over in TurboTax Online? has information that you may find useful.

[david-w-millar]

I'm in a similar situation and received an email notification stating "You're using a new TurboTax account this year."

I recall using the same username for the old account and have not found a way to access it.

Is there a way to enumerate all my accounts or at least find the username for the old account?

I need this information to exercise my 2023 tax return audit protection. 

[DoninGA]

@david-w-millar See this TurboTax support FAQ for how to view all of your TurboTax accounts - https://ttlc.intuit.com/turbotax-support/en-us/help-article/account-management/many-intuit-accounts-...

[DawnC]

Yes, you can use the option in the link below to find all of your accounts.  How many TurboTax Accounts do I have?   @david-w-millar