Did you go through the amendment interview to add the additional W2? You cannot just add your W2 to your return after you filed, you need to amend it. Amended returns must be mailed.
If you did not go through the amendment interview you need to delete the additional W2, then amend your return.
How do I amend a 2016 return in TurboTax?
https://ttlc.intuit.com/replies/5114064
