Webster’s 1913 has no entry under this spelling.
Shades of meaning
Fernald has no entry of its own for uncongeniality; he lists it under antipathy.
Where he writes about it:
Antipathy, repugnance, and uncongeniality are instinctive; other forms of dislike may be acquired or cherished for cause. — from antipathy
Uncongeniality is negative, a want of touch or sympathy. — from antipathy