usage metrics not working for office 365 team

In the Power BI service I can view the usage metrics for a report when the report is in "My workspace" or in a workspace that was created as an Office 365 Group.

We have now started to roll out Office 365 Teams, and when I publish a report to this (several weeks ago) the Usage Metrics report is blank for usage (views per day, and unique views per day etc) and just shows a single value in "Total Reports in Organization" that agrees with the value on the Usage Metrics report in the other worspaces.

We have not tried "app workspaces" yet.

Is there a setting somewhere to switch on to capture usage metrics for content creators for teams? I have only read about switching it on for the tenancy.