Scheduling API Gateway based URLs

I am trying to schedule an HTTP based url in API Gateway via GCP Cloud Scheduler.

I feel like i should be using OAUTH based authentication but if OAUTH is selected we see the message…

“… host must end with “.googleapis.com” for a job with an OAuth authorization header”

The API gateway domain is ******.cloud.goog

How do i go about scheduling it via OAUTH? We tried OIDC but authentication fails in that manner and the API is configure to be of “type: oauth2”

I got around this by hitting the cloud run instance directly, not ideal but it works I guess. If anyone work out how to do this via API gateway let us know.