Authenticating in an API

no,

https://api.freshservice.com/v2/#changelog

Authentication

How does it work? Who can access my helpdesk? Can everybody see my data?

Before you can set the priority of a ticket or change a customer’s name or use any of the APIs listed above, you need to “authenticate your ID” or “log in” in the same way you log in to your helpdesk’s web portal.

so possibly:

as a security measure you need to be
LOGIN
just API alone might not work

but that can only be answered
https://support.freshservice.com/support/discussions

or you have any reason to believe that it is a processing issue?