I e-filed 1040 through Turbotax, but when trying to e-file its amended return TurboTax said I didn't file 1040 through it

I e-filed 1040 through TurboTax, then I realized I need to file an amended return.

I'm using the Mac version and started the amended return by:

1. File -> New Tax Return

2. In the "Welcome to TurboTax" page select "amend a return (make changes) after it was filed and accepted by IRS"

3. follow the instructions on "We'll help you change (amend) your return"

4. after making the changes and ready to file the return it told me I didn't file 1040 through TurboTax

5. then I open the filed return in another tab, and check the e-file status, and it shows the return has been accepted by IRS. 

Any idea how to get around this?

Thanks!