If you used TurboTax to e-file the extension request you must sign onto your online account with same User ID you used to create the account and start the 2023 tax return - https://myturbotax.intuit.com/
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-turbotax/L9aVfKS1Z_US_en_US?uid=ll5g6zcx