How to generate a custom font from Glyphs and upload to Figma?

I’m trying to generate a custom font from https://github.com/uswds/public-sans using their build script which outputs ttf/otf files. 

However, when uploading custom fonts (named different than Public Sans) in the Resources > Fonts to be shared across my organization, the custom font does not render correctly.

I can see the custom font in the font dropdown, but in console, I get a 404 for 

https://www.figma.com/api/fonts/1205729/file/8VD5apkKPfyFkBPBUFICZB with response:

```

{
    "error": true,
    "status": 404,
    "message": "Not found.",
    "i18n": {
        "id": "error.not_found",
        "fallback_text": "Not found.",
        "params": {}
    }
}

```

Are there specific rules or validation issues for uploading custom fonts for an organization? When I install the OTF font locally in FontBook, it works - but I want my entire organization to use a custom generated font.