I found an error after filing online. When will i be able to file an amended return?

[pbesong]

I filed my 2019 return, but remembered something that will require filing an amended return. My return was accepted by both federal and state already.  TurboTax says amended returns are not available till "late february". Is there a certain date it will be available? 

[Critter]

ONLY when you have both the original fed & state refund in hand should you start the amendment process ... estimated to be ready 2/20.