In the iOS app the error message says "game update failed". Is this a server bug?
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Chess.com does not let me castle in this game although it should be possible. Is castling not possible in custom position games?


https://www.chess.com/game/daily/685872669
It let me select the castling move but when i hit accept i get the red error message about an illegal move and it resets my move and shows me the recent move of my opponent again.