I am trying to netfile and it says the submission was confirmed and can not pass through a second time. Why won;t the site allow me to netfile.

To clear this issue, you need to first verify if your return was filed as indicated, by following this TurboTax FAQ How do I know if my return was filed using NETFILE and received by the CRA?.

If needed, in this Canada Revenue Agency link, you will find a list of "Restrictions" that will prevent a taxpayer from NETFILE.