Unable to "Get Credentials" for Adobe PDF Embed API

So, when my user tries to click the "Get Credentials" button at 

https://developer.adobe.com/document-services/apis/pdf-embed/

we get the error (You don't have access to PDF Embed API (attached image Error Message.jpg). Cannot figure out why. I have no problem with the Get Credentials button. Obviously I could do it and pass the information to my user but that is a bit cumbersome as a working model. I tried contacting Adobe Support but they were singularly unhelpful, pushing me to "get on the forums". So, here I am. I'm hoping someone can explain this to me.

Thanks!