It is possible your 2019 return has not yet been processed as they are behind on returns currently.
You can track the progress of your amended return by using the Where's My Amended Return here.
Since your amended return is yet to be processed, use your AGI on the original return from 2019. If that does not work, then use 0.
Please check the FAQ here for a rejected return.
If you need additional assistance, you can contact customer support by clicking here.
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