My amended state return was rejected with the message "R1004 - You can only file 1099G for unemployment income from NYS Dept of Labor". What does this mean?

[DawnC0]

My guess is that you added a 1099-G for unemployment to your federal return to amend, but the 1099-G is not from NY.  If you amended your federal return and added unemployment income from a different state, then you do not need to file the NYS amended return.