You can use Help>Report an issue… in the menu bar which will send a report to the Team who can look at the document to see what is happening there.
If you can give more detail here then someone might be able to help you. Think about things like:
- Did you add the font using Hype’s “Add More Fonts…” button?
- If you did… did you get a screen like this when you exported?
Also, you can search these forums with the keyword “Monotype” and see if anyone else has had a similar problem.