hello, i was trying a testdome python test

[twinstars2020]

hello, i was trying a testdome python test but failed the 1st question despite getting the required answers. Any idea or advice why and how to improve my statements?

def unique_names(names1, names2):
    return None

if __name__ == "__main__":
    names1 = ["Ava", "Emma", "Olivia"]
    names2 = ["Olivia", "Sophia", "Emma"]
    joinednames = names1 + names2
#    print(joinednames)
    
    output = set()
    for x in joinednames:
     output.add(x)
    print(output)
  #  unique_names = set()
  #  for x in joinednames:
  #   joinednames.add(x)
 #   print(unique_names(names1, names2)) # should print Ava, Emma, Olivia, Sophia

my results were {'Ava', 'Sophia', 'Emma', 'Olivia'}
test is random and not a very big samples - available here Testdome URL for Python