Can't stitch naked edges on SubD model

Hello,
I am having hard time trying to stitch naked edges on SubD model. Somehow it sometimes stitch and sometimes not, can’t figure the logic of it.

If anyone could examine the model and explain why edges won’t stich.
Regards.

stitch_edge_issue.3dm (223.5 KB)

There seems to be a problem with selecting the edges because they’re in the same position…

is this the result you want ?
stitch_edge_issue_tp.3dm (294.1 KB)

AlignVertices (0.5 mm tolerance)
Join
removeCreases

kind regards -tom

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Ctrl+a (select all) then Join.

add creases as needed.

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