Automatic Page Refresh - Tenant settings

Automatic Page Refresh has been available since the October update:

https://powerbi.microsoft.com/en-us/blog/power-bi-desktop-october-2019-feature-summary/#automaticPageRefresh

I got it working in Power BI Desktop. However it doesn't work in the PBI Service - I get the following message:

Our Power BI purchased Capacity is A1 SKU (configured via Azure Portal) for dev to confirm functionality works for our use cases. 

I'm a Power BI Capacity Admin, however I can't find the settings relating to this feature anywhere? I've checked all settings across workspaces, pages, the PBI Admin Portal, Azure Portal....

Can someone point me to where I can configure this page refresh settings please? I'm stumped....