PowerBi Report Server can not connect with datasource in Cloud

Hello everyone, I've got a question.

I have visualised a SharePoint Online list in PowerBI Desktop.
I only have permission to access the SharePoint list with my MS-account.
I saved the report on our onPremise PowerBI Report Server.

On the report server I can only log in to the data sources with my Windows-authentication and not with my MS-account.

It cannot connect.

But I urgently need this for the data refresh.
I have already loaded the SharePointOnline list as oDataFeed, but that doesn't work either.
Can anyone help me?

Best regards!