I too am receiving a error message saying that the earned income comes from undocumented sources.  In my case I have an amount entered for Medicaid Waiver Payments on line 6 of the EIC Worksheet.  I had this in 2020 and had no issues filing electronically.  How to contact anyone at Intuit for this?

If I enter Earned income from 2019 return as a larger amount then the current year earned income and check yes to use 2019, then I don't get the error message that I do as I mention in the first paragraph.  But my question here is can I use the amended Earned income amount from 2019 when I am in the process of amending 2019? I know what the new earned income amount is. I have a feeling this refund will take forever for them to get and amending 2019 might also be confusing and could prolong the refund.