Since you filed by mail, the AGI might not yet be in the IRS's system yet, and therefore, you can try to enter 0 if your actual AGI doesn't work.
You can choose a new self-select pin each year as well, it does not have to be the one from a previous year. For more information, please see What is the difference between the five-digit Self-Select PIN I created last year and my Self-Select... for more information.
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