we can't publish this power bi desktop because it contains an unsupported data source connection

[khoughton]

Trying to use SQL server as data source. Trying to publish to On-Prem Power BI Report Server.

When will this be supported?

[v-ljerr-msft · Accepted solution]

Hi @khoughton,

As commented by Riccardo Muti in this blog, they're targeting SQL data sources to be used in the Power BI Report Server later this year. 

Regards