Tiny fail question

I’ve modeled this surface to what I wanted but I’m left with a tiny problem I’m not sure how to solve. The methods I used to build the joined surfaces are all the best method I can determine.

How does one deal with this issue. I checked for any bad surfaces and there are none.

I’d attache the model but the surfaces are so heavy the filed compressed is almost 30mg.

I’ve tried rebuilding the underlipped surface but afterwards it will not join completely with the other surfaces.

Any suggestions as to a more efficient solution here?