REST API crashes when using ClientCredentials OAuth


We're trying to use the REST API for various external utilities to manage our data.

We are able to authenticate with Verint using ClientCredentials Oauth described here:

This works, we get an accessToken, refreshToken and expiry as expected.

However, when we try to use the accessToken in a request to pull some data, Verint crashes with a 500.  Here's what I'm seeing.


Authorization OAuth ece87f99a41b4ff892f703b5cb89fb131d8262b9e9ae4bf5b37aeff562446664
Accept application/json


500/Internal Server Error
Date: Wed, 30 Jun 2021 22:12:19 GMT
Content-Type: text/html; charset=utf-8
Content-Length: 2498
Connection: keep-alive
Cache-Control: no-cache, no-store
Pragma: no-cache
Expires: -1
Server: Microsoft-IIS/10.0
Content-Security-Policy: frame-ancestors 'self';
X-UA-Compatible: IE=Edge
X-XSS-Protection: 1; mode=block
X-Content-Type-Options: nosniff
X-Telligent-Evolution: 12.x
X-Powered-By: ASP.NET

Is there a problem with how I'm formatting my GET request?  Note that the format of the Authorization header is OAuth [TOKEN] instead of Bearer [TOKEN] per the documentation here:

Thank you,