How to set the actor of a davis analyzer via API properly?

[r_weber]

I'm struggling with configuring a Davis analyzer via API. Monaco gives me a response:

"message":"User has no permission to use service users"

Under actor I've added the UUID of my service user, this user does have "iam:service-users:use" permissions. Verified int he account effective policies.
I even changed the Monaco OAUTH client/user to include that permission, still no luck.

{
    "enabled": true,
    "title": "CloudSQL CPU Utilization",
    "description": "Baseline Alerts for CloudSQL CPU Utilization by instance.id",
    "source": "Davis Anomaly Detection",
    "executionSettings": {
        "actor": null,     <== ? service user id full name?
        "queryOffset": null
    },

 
I'm missing something here, or the documentation is wrong 🙂