it turned out "
It looks like you should be able to efile your Georgia amendment. Can I e-file my amended state return? - TurboTax Support - Intuit
Did you try to file it at the same time as your federal amendment?
The instructions should be the same for filing a state amendment after a federal: How do I e-file my state after I already filed my federal?
If you continue to have problems, please call TurboTax Customer service. Here is a link: Turbo Tax Customer Service
I have the exact same issue. I was able to file the amended Federal return today, but not the state. I have the same error message.
Here are instructions provided by TurboTax on how to amend the state return after the federal has been filed: