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"
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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.