Hi TJ,
To access any client data via REST, you'll have to authenticate first. There are three methods:
- HTTP Basic, Eloqua REST API - Authenticating
- OAuth, OAuth and Eloqua
- xsrfToken + Cookie (in header), this is what the application itself uses in the browser
Your error most likely means you tried to access a URL with the token from another app or browser that didn't have the cookie value in the header of the request. You can remove that query string if you choose to use the other two methods.
Regards,
Bojan