Authentication to an on-premise UiPath installation differs from the authentication procedure with the Cloud offering.
See here for on-premise authentication: https://docs.uipath.com/orchestrator/reference/authenticating
See here for Cloud Automation authentication: https://docs.uipath.com/orchestrator/reference/consuming-cloud-api

AT
I can configure authentication information for an on-premise UiPath installation with a tenant-name, user and password.