For anyone following up,
Imaverick wrote into the help desk about this, and we were able to resolve the issue by having the user first install the latest OTF font files from Font Awesome 5 (now version 5.1.0):
And then adding a font mapping entry to map the Solid icons to Solid and the Regular icons to Regular. To clarify, we do have a known issue on file where the Solid icons don’t render in the output using the CSS link for Font Awesome 5 (they revert to Regular), so you’ll need to map the Solid icons to the Solid font weight in the Font Mappings tab of the HTML generator, as well as adding a Web Fonts entry. Here’s a screenshot of how the font mapping should look:
If anyone is running into a similar issue and the above steps don’t help, please write into the help desk (support@axure.com) with your RP file so we can further troubleshoot. Ty!