It sounds like you tried to amend your 2023 tax return but it was rejected.
If that's the case, please see What does my rejected return code mean and how do I fix it? for more details on fixing the rejection message.
If you are unable to electronically file it, you still have the option of mailing in the amended return. Please see Can I e-file my federal Form 1040-X amended return? for more details.
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