Not able to enter data source credentials

Let's see. We can find a work around.

When working with Datasets you get data from a sharepoint file to PBI Desktop. You connect credentials. Create the report and Publich to Service. At service you have to set the definitive credentials for the deployment. You can modify those for the File any time. However, if you want to get other file or other folder or any other source. You have to modify the PBI Desktop file again to get the data.

If you really need to work with the data at PowerBi Service because you have a mac or the person that builds the report data visualizations is not the same as the one hadling data. Then you can create Dataflows. Dataflows are a PowerBi Service tool that allows you to get data from sources. Then users that build reports can get the cleaned prepared data from dataflows instead of the sources.

I hope that make sense