If you return should reject, try entering zero for the AGI and resubmit the return. It's not clear if your spouse died in 2020, or 2019.
The IRS Validation for e-file may provide some other tips for you.
Just to confirm the IRS record of AGI is the same that you have you can also request and IRS Transcript Online.
If you are unable to process your return you must mail it.
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