Interestingly enough, Sinqua also didn't know he had even auditioned for the role of Lancelot. In the new Entertainment Weekly Fall TV Preview, they explained how OUAT held deceptive casting calls to try and keep spoilers under wraps.
For example, actress Sarah Bolger had auditioned for "Anastasia" before getting cast as Sleeping Beauty, and Sinqua told EW, "My manager called and said, 'You got the role of Lancelot!’ I was like 'I don't remember even reading for Lancelot!'"
Welcome aboard, anyway! Glad to have you — as long as you don't mess up the Snow/Charming love story. We can’t deal with more people getting in the way there.