RLS When Using Power BI Service Data Connector

[Anonymous]

We are connecting our PBI file to an existing dataset on a Premium workspace using the Power BI Service data connector (Open up Power BI Desktop>Get Data>Power BI Service). The existing dataset on the service is using Row-Level Security which uses the UserName() function in Dax. When I connect my new PBI file pointed to the service's dataset the UserName() is returning NT Authority\System. Has anyone run into this, how would I return the username of whomever is running the report? I assume since I am not logging into app.powerbi.com directly to access this dataset, it has no idea of who I am, so it's returning the System account. Anyone using this method with RLS and have a working solution?

[v-yuezhe-msft]

@Anonymous,

I can reproduce your issue, I will consult this issue internally, and post back.

Regards,
Lydia

[C_H]

Any update to this? We have the same issue. Our Users work with Power BI Desktop using direct Connection to datasets in the service.

[slomkak]

It has been a long time, but this issue still occurs. 

It can be solved by adding a role to a dataset. It is very similiar to below case:

Using Username() in DAX with Row-Level Security | Microsoft Power BI Blog | Microsoft Power BI

It seems that with workspaces in shared capacities USERNAME() returns a guid value, while in Premium capacitites it returns "NT AUTHORITY\SYSTEM".