If you transferred your parents joint return for 2024 into the 2025 program and reported them both as deceased in 2025, then it should be you (as personal representative) who would sign the 2025 return.
If this applies, step through the Personal Info section again; there is a place to indicate that you are preparing the return for a deceased person, giving your contact info. Since your dad was alive as of 12/31/2024, they would have both 'signed' the 2024 return.
Sometimes the IRS flags the SSN of deceased persons, so this may be affecting you. You may need to mail their 2025 return.
So sorry for your loss.
@Kracks
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