You are not authorized to access this page.

I have a Util BML Library Function that calls the _configure API using the current user credentials. This works fine in our test environment but I receive the following authorization error in production.

ERROR: Server returned HTTP response code: 401 for URL: https://companyname.bigmachines.com/rest/v14/configES_.ES_.EBESULFB/actions/_configure - {"error_description":"You are not authorized to access this page.","error_uri":"HTTP://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html","error":"You are not authorized to access this page."}

The users that use this utility are all set up as User Administrators and I see no difference in their user settings.