You're doing everything right except you're trying to shoot bow torpedoes with a stern solution or stern torpedoes with a bow solution. Whatever the case you're getting a gyro angle order in excess of the typical +/- 135° limits (instead of the 0° you want) which will prevent a launch.
Make sure you've selected a stern tube and then point 180° (0 speed, you know the drill) on the periscope to set up a 0° gyro angle order shot. You can mouse over the lower dial in the left TDC page to check what gyro angle order is set in the popup tooltip.
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