https://community.powerbi.com/ is the best place to post questions about Power BI. That way you have a much better chance of someone who is an expert in that area seeing your post.
In the meantime, you may want to look through the documentation on the On-premises Data Gateway that lets you connect the Power BI service to your data warehouse: https://learn.microsoft.com/en-us/power-bi/connect-data/service-gateway-onprem-indepth