Adam, can you post your part here for us to take a look at? Thanks Tom
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Most likely, you will not be able to remove that "edge" in your model. This looks like a Sub-D and therefore is not a true sphere (if that's what you want.) You might be better off just recreating in SW and using import for reference.
I think the only feature that will fill in an area without leaving a tangent edge is the untrim feature. You could try deleting the face and then untrim the side that it should be continuous with. It might not work but that's all I can think of.