I’m can’t seem to find the N̈ character within the Glyphs apps. The client wants it included in the font, but if I manually add it, it has no Unicode reference assigned to it.
That’s because n̈ and N̈ are not encoded in Unicode – they have no codepoints.
If you want, you can add them to your font as precomposed glyphs and add a substitution rule that substitutes n dieresiscomb and N dieresiscomb with that glyph… but as long as you have your anchors set up correctly, there shouldn’t be a need to.
You need: N and dieresiscomb, optionally also dieresiscomb.case.
You update the features. You want the automatically generated ccmp.
You can generate: N_dieresiscomb(.rlig). But it should work in most environments without this glyph. Not sure if this is still true, but Adobe’s classic composer has always been the notable exception.
Then you client needs a keyboard layout that can produce the sequence N, dieresiscomb.
Thanks so much, that really helps. Someone from the company previously worked on the font I created, which left me with glyphs I couldn’t export, due to their naming and creation.