If you didn't file for 2023, entering $0 for your last year's AGI in the Efile interview is the correct way. You will need to choose a 5-digit PIN also.
If you're using TurboTax Online, clear your Cache and Cookies, go back to the File section and step through the interview and enter $0, and try Efiling again.
What was your Reject Error message?
@benzhu926
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