Patch surface fail

Ive designed a ring but I’m unable to join the patched surface to the rest of the ring. I can see how unorthodox the edges of the patched surface are. Can someone describe what measures I
can take to fix it so that I am able to create 1 closed polysurface?
ringy.3dm (2.2 MB)

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those 2 closed polysurfaces should become one ?

EDIT:

I think you have to remodel / rethink / redesign this (extracted and colored) red Surface. it is somehow twisted and therefore will always cause problems.
one edge selected.

just for better understanding - to show the problem:
the red surface on it s own, scaled only in z

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my favorite way to use patch and get the right shape without going crazy with isoparms is the pipe trim trick. It allows you to use much simpler patches without worrying about the join.

video here-

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