Translation:Did anybody recognize you? No. Nobody recognized me.
Does [ghov] mean "recognize" as in "to identify as something or someone previously seen, known, etc.," "to acknowledge," or both?
Other sentences in this lesson accept "[subject] does" for a repeated verb, but this one marked me wrong for "nobody does". Am I missing some subtlety there?
No, if other sentences allow it, this one should as well. You are not missing a subtle difference.