Hi Adam aatracksler ,
could you post a Screenshot of what you are trying to fill, please?
Trying to describe Topology leaves to many questions unanswered.
(Also make sure, that the two Edge Loops belong to the same Object.)
https://vimeo.com/1038964049/54cdb6437b?share=copy
Here's a video of everything I'm doing.
It looks like the issue is when I extrude and lock to the second vertex. When I select the vertices that should be overlapping, only one vertex is selected. If I move one vertex, I can select two, and the whole thing works (albeit changing the geo a bit). Why cant I select both verts when I snap them?
https://vimeo.com/1038981986/15e0ffe2af?share=copy