Hyphen won't show up after export

When I export and test in Illustrator (CS6 and CC) the hyphen won’t show. It says “no glyph”. Giving the glyph different unicode (switched between uni2010 and 002D) does not help. Opened up other fonts etc. but I can’t see what the problem is. Who can help?

You should just add a glyph called “hyphen”. And make sure you read this:
Eliminating Font Cache Problems | Glyphs
Testing Your Fonts in Adobe Apps | Glyphs

Hey Georg,
thank you very much! One of the things you mentioned, did the trick! (Not sure what exactly…)