Election official income and roth contribution

I earned $550 in 2024 as an election official.  My earnings statement noted the amount was excluded from federal taxable wages.   I received a W2, which showed no amounts in any of the boxes.  Meanwhile, I contributed the full amount to a Roth.  When inputting that into Turbo Tax, the system shows I contributed more than I earned and noted a penalty.  How do I show that I did earn that income to offset the Roth contribution?