Reverse proxy for Adobe PDF Embed API

We have successfully set up a reverse proxy on our server to the main.js file. (to get around security blocking sofware) We can now pull in the Adobe PDF embed API js file in the following url: 

https://dr-www.mfs.com/view-sdk/main.js

However the PDF component starts to appear on the page but fails to complete rendering. After reviewing the developer console, it appears that there’s a JSON web token that fails to load? Is this connected to passing the client API key back to Adobe? Is there a workaround for this issue?