Help with API and Helpdesk event



I have the API working when signing into my own created endpoint and events. I can get a list of users so that works well. My problem is that I now need the authenticators that each user enrolled. In order to call that you call the following api:

GET /api/v1/users/{userid}/templates?login_session_id={sessionid}
When I call that from the API logged into my own endpoint and session, I get an error that says I need to be logged into the AdminUI or Helpdesk events in order to call that API.
I cannot figure out how to login to either the Helpdesk or AdminUI events. If I use my endpoint id and secret to get an endpoint session id and specify "Helpdesk" as an event, it just says the "Helpdesk" event is not found.
Any assistance will be appreciated.