If you have your father's 2023 return, you can enter his AGI instead of a PIN. The IRS requires either/or for identification.
If he used TurboTax in 2023, and you transferred his 2023 return, the PIN he used last year will already be filled in.
Not sure why DOB would be an issue, if it's correct in the Personal Info section. Did you indicate you're filing for a deceased person? What is the DOB error message?
If you're using TurboTax Online, clear your Cache and Cookies before Efiling again.
Sorry for your loss.
@DDavies0504
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