It is not permissible to eat after the Athan unless a person knows for sure that the dawn has not started.
And Allah knows best

I would like to ask you if it’s okay to eat after the Adhann. Usually when I fast, I still eat 5 minutes after the Adhann, because I go by what Allah SWT say’s, looking at the sky to see if it’s light out or not.So is it okay to eat after the first Fajr Adhann until the second