In the Google Cloud Console when you are in Google Cloud Functions, in the upper right click on "View in Cloud Run" This will move you to the associated Cloud Run.

Once there click on the info "ⓘ" by the URL. This should pop out a window on the right that has alternative URLs assigned by Cloud Run.

Instead of using a URL that looks like:

https://us-central1-<project_name>.cloudfunctions.net/personlookup

You want to use a URL that looks like

https://personlookup-.a.run.app

or

https://personlookup-.us-central1.run.app