Margot Robbie had a failed audition for American Horror Story: Asylum, it’s been revealed.In an interview with Backstage, AHS casting director Eric Dawson said that Robbie’s audition for an unknown role — which many fans believe to be Lizzie Brochere’s Grace — is one of his favourite auditions ever.“Margot has a lot of ‘it’ factors. That’s the tough thing for casting directors who aren’t in the room [anymore] with actors,” said Dawson.“Margot is probably one of my favourite auditions of all time, and it was right before she broke out.