That's because EFW for GA ES-tax is not supported: https://proconnect.intuit.com/support/en-us/help-article/banking/e-filing-quarterly-estimates-procon...
Your client can go to the GA DoR website to set up electronic payments.
You have clicked a link to a site outside of the Intuit Accountants Community. By clicking "Continue", you will leave the community and be taken to that site instead.