So I've been doing a bit more digging into this and I've got CRONR to work okay, where it's falling down is the googleAnalyticsR package. It fails to run when the script is automated stating that the "default" package isn't meant for "production".
I've tried going through the steps to create a new project in google cloud but I've having issues swapping the authentication to pull from my GCP rather than the "default" googleAnalyticsR package.
Have you had any experience with this at all?