I'm using SelectPdf to render PDF's on my Azure Web App, and it turns out that the Azure sandboxing model means that custom web fonts (OTF, TTF, etc) cannot be embedded in PDF's. Apparently the issue is the same for other PDF generation tools.
Microsoft have confirmed they are not currently fixing the issue but have it in their future plans: https://feedback.azure.com/forums/169385-web-apps/suggestions/32622797-support-custom-web-fonts-in-azure-app-services
I'd like to know what fonts are already installed on Azure Web Apps that would be available for use?
Looks like this is the standard Windows fonts list:
https://en.wikipedia.org/wiki/List_of_typefaces_included_with_Microsoft_Windows