Here’s a start-to-finish workflow for adding a font: How do I add SF UI Display + Text fonts to prototype for IOS9? (San Francisco Mac System Font)
It is likely not working in IE because it can’t load the .ttf file – so it needs additional font formats (I’m not positive which IE requires).
Keep in mind once your font is added to your resource library, you’ll need to use ${resourcesFolderName}/file.ttf to access it in your code.