Have you tried using 127.0.0.1 as an alternative to localhost being the domain?
In addition, the request to https://pi.pdfjs.express/events is gathering tele-metrics, and isn’t used to check the license key.
If the PDF isn’t loading after making the correct request to the auth server, there may be something wrong with the PDF. Are you able to load this in the demo?
Is there any console error messages and any failed network requests?
In addition, there may be some errors in how your keys are setup, please see this forum post for more information: