I am seeing the same error when creating a new Cloud-to-Cloud integration in Google Home Developer Console:
“INVALID_ARGUMENT: privacy_policy_url cannot be empty”
What I already verified:
Google Auth Platform > Branding is fully configured and saved
Homepage, Privacy Policy, and Terms URLs are set
Authorized domain is set
Company profile in Google Home Developer Console was submitted and is now “In review”
The privacy policy URL is publicly reachable
Home Assistant endpoints are reachable, and /api/google_assistant responds correctly
I reproduced the issue in a brand-new project, in incognito mode, and from another device/browser
So this does not look like a missing field on my side. It looks like the Google Home Developer Console is still not reading the saved privacy policy configuration when saving Cloud-to-Cloud setup.
Could Google please confirm whether this is a known console/backend issue, and if there is any workaround?