You are correct, if you filed a joint return for 2019, then the same AGI will be used for both you and your spouse.
Is it possible that the number was just entered incorrectly by mistake. Try to file your return one more time. If it still rejects, take a look at the following TurboTax article for more information and possible solutions:
TurboTax Online instructions for E-file reject IND-031-04 or IND-032-04: The AGI or Self-select PIN ...
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