Problem with PowerApps custom visual and PowerBI App

Hi Guys

I've created a PowerBI report and itegrated it with my PowerApp using PowerApps custom visual. The report has been published to PowerBI.com service.

It appers that it works fine if users open the report from workspace, but it does not work when users access it through PowerBI app (without having access to workspace) - PowerApps custom visual simply does not show up (the rest of the report works OK)

What could be the reason?

Thank you,

Max