TurboTax does not reject your return, the IRS (& State) rejects your return for the AGI. If you filed as Married Filing Joint in 2020, then you need to enter the same AGI for each of you from your joint return. Do Not split it.
If you filed a Married Filing Separate & now are filing joint, put the AGI from each of your separate returns.
If all else fails, try using a Zero for the 2020 AGI.
