Data from Salesforce objects don't refresh after publishing

Hello, 

I created a dashboard in Power Bi desktop using data from Salesforce objects. In desktop version it works perfectly, but once I publish it, the data don't update in the online version. I've tried to refresh, but nothing happened. It stays in the same form as the dashboard was at the time of publication even if the data has already changed. I checked the gateway connection, but it says I don't need it since data sources are in the cloud.

What should I do to make the refresh work? 

Thank you, 
Magda