Translation:The child is eating the chicken and an egg.
For not translating this sentence as the continuous, it has been marked as wrong. Would a moderator please check this?
Please upload your screenshot (showing your answer and the error message) to a website and post the URL to the image into a comment here. Thank you.
If you are asking if "eats" also acceptable...yes it is. So, if your sentence was rejected it was not due to "eats". But just showing us one word makes it impossible to determine why your sentence was rejected.
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And check out the Greek Forum here with more links.
As for the other issue that is not within our jurisdiction. This Forum is for language-related discussions. This sounds like something to notify Duolingo staff of directly: https://support.duolingo.com/hc/en-us