7890 (7693 autosampler) GC System rear tower will not sample.

Running on MSD Chemstation e.02.00.493

On chemstation I have what I would think to be the right set up ( [Keyword Dualmeth Method name] [keyword unlinked], alternating Rearsamp& Sample), however, it appears that the rear tower is not responding to rearsamp. What could I be missing?

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