We are currently running Report Server Version 18.104.22.1687 and would like to know how do we go about checking which versions of Power BI Desktop are compatible with this Report Server version. If we create a dashboard in a later version of Power BI Desktop and try to upload it - it gives an error around and does not allow the upload of the dashboard?
Power BI Report Server (PBIRS) updates are currently released each Jan, May and Sep. With each update comes a new version of Power BI Desktop for Report Server (PBIDRS) that supports the new features in that update.
Older versions of PBIDRS can work with newer versions of PBIRS.
Newer versions of PBIDRS CANNOT work with previous versions of PBIRS.
Your PBIRS version is Aug-2018. I will conclude you are using the latest PBIDRS (Jan-2019).