DirectQuery to Oracle in PowerBI on PowerBI Report Server 03-2018

Hi All,

Is it possible to use DirectQuery to a Oracle instance use the report on PowerBI report Server 03-2018?

It connects when the report is opened locally but not on the server. The following error is shown:
    Something went wrong

    We couldn't run the report because we couldn't connect to its data source. The report or data source might not be configured correctly.
    Please try again later or contact support. If you contact support, please provide these details.

    We couldn't connect to the Analysis Services server. Make sure you've entered the connection string correctly.
    Request IDbe5e4945-6a64-1d22-157d-c23683365c28
    TimeFri May 04 2018 14:14:08 GMT+0200 (W. Europe Daylight Time)
    Version15.0.2.389

The report uses embedded database credentials.

Thanks in advance for your reply!