Mimir multi tenant query

I’m currently evaluating Grafana Mimir in a multi-tenancy setup. We would like to be able to have our administrators query all tenants.

I know this is possible by setting tenant_federation.enabled = true in Mimir and setting X-Scope-OrgID header on the datasource in grafana to include all tenants.

I’ve tried using ‘*’ and ‘’ as values to query all tenants but that doesn’t seem possible? Is it possible?