Correct username

validation.py

@@ -111,7 +111,7 @@ def post_submission() -> None:
     space_id = os.environ['SPACE_ID']
 
     submission_json = {
-        "username": os.environ['USERNAME'],
+        "username": os.environ['HF_USERNAME'],
         "agent_code": f"https://huggingface.co/spaces/{space_id}/tree/main",
         "answers": [{"task_id": id, "submitted_answer": a} for id, a in results.items()]
     }