https://community.fabric.microsoft.com/t5/Power-Query/On-premise-Gateway-and-an-Oracle-Datasouce/m-p/117206
Solved: Re: On premise Gateway and an Oracle Datasouce - Microsoft Fabric Community
Sep 21, 2018 - Hi , What error message do you get when you add Oracle data source under on-premises gateway? As stated in the following article, Power BI gateway
on premise