En passant on Analysis

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christhebus
Very annoyed today. I was using analysis to plan my next move on a daily chess game and it showed en passant as unavailable for my opponent. Stupidly I moved my pawn and lo and behold my pawn was captured, effectively losing me the game ☹️
bigD521

 You are aware that using analysis - the one to 5 lines is illegal, but making moves on the board without the lines is fine.

Please explain what you mean by it showed you.