newbie font question

i just tried this link and all worked ok for me on Ai

https://www.theleagueofmoveabletype.com/ostrich-sans

Jane,

Illy is particularly particular about the quality of fonts, because she can work with them at a deeper/higher level than most, so you can easily have a font that works in all other applications, but Illy refuses to recognize it as a font.

Some failing fonts discussed in earlier threads have turned out to have rather basic flaws, such as redundant, superfluous, or (if I remember rightly) even stray points, or other clear errors in the paths that they consist of.

You may need to look for similar fonts that Illy is willing to work with.

When you say that all work in other programs it is unclear if you are saying that the bold weight is recognized in the other programs. Could you also be more specific as to exactly how you've installed your fonts? If you are using a font utility like FontExplorer then check it to make sure that all weights of the font are checked as activated.