Where can I complete the General Conditions of Employment (TP-64.3) form?

When I try submitting my Québec Tax, I’m getting a message saying that as I have completed Part 3 of (TP-59.S) form, I must also complete the General Conditions of Employment (TP-64.3) form.
I spent 1 hour with Turbotax tech support yesterday. Have you been able to solve this issue? This is preventing me from submitting my Provincial document.