Adobe support determined that the error (for our team at least) was a result of our Adobe contract type. In order to leverage these APIs you need to have an Enterprise contract with Adobe.

We are experiencing the same issue while trying to set up a User Management integration. I've tried uploading the public key as both a CRT and PEM file, both result in the same error message.Argh, your certificate is not valid!Check this url for a tutorial on how to generate a valid certificate.( re...