Okay, I did everything to get the Barheim Key, and I now have it.  I went to
the Dalmasca Estersand/Passage Entrance to the Barheim Passage.  Only
problem is, I can't enter the Barheim Passage.  I approach the obvious
entrance but no prompts come up allowing me to enter.  I'm at the point in
the game where I've reached the Tsenoble part of Archades.  Did I screw
up... have I gone to far in the game and I can't get this mark anymore?

Thanks in advance!!!!!