this post may be helpful
But looking at your model it looks like there are windows touching the edges of the Brep, which also is invalid. I can’t remember if curved/circular geometry is allowed or not, I know at one point it wasn’t supported and that still may be the case.
each of the above instances will cause the face to not ajoin with the parent face
for instance windows touching eachother, and touching edges:
I hope that helps
best
-trevor