SSAS tabular as a source - map user name

Hi, 

Reading this article below on mapping usernames on the source. 

Does anyone know if we have to use .local on the UPN or is this just example for whaterver is local?

https://docs.microsoft.com/en-us/power-bi/service-gateway-enterprise-manage-ssas#map-user-names-for-analysis-services-data-sources