SSRS (Power BI Report Builder) Parameter Join not working on server?

Question

I am having a report bu unit which is filtered by bunch of different feilds such as customer,type and date and on the top of the report I want to display each unit which makes up the entire report 

To get this working I have tried to use multi select parameter for "units" and returned the by using the formula

JOIN(Parameters!Units.Label, ",")

Answer 1

Report builder added functionality that provides an efficient way for Business Users to connect and develop data source against SSAS database

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