You cannot castle there because the knight is still on d8. To castle you would drop the king on the rook, but the king will stay on c8 and the rook will go to d8. In 960 when you castle the king and rook go to the same squares that they do in regular chess.
Can't Castle in Chess960
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After the third move I want to castle. All possible K or R moves (e.g., Kb8, Kc8, Rc8 Rb8 etc.) are not allowed or result in the K moving one square to b8 not O-O. Is this a known bug?
Any other ways to input moves in Chess960 to castle?.