USERNAME, USEROBJECTID, USERPRINCIPALNAME, CUSTOMDATA, USERCULTURE – DAX Guide
USERNAME: Returns the domain name and user name of the current connection with the format of domain-nameuser-name.
https://dax.guide/username/
USEROBJECTID: Returns the current user’s Object ID from Azure AD for Azure Analysis Server and the current user’s SID for on-premise Analysis Server.
https://dax.guide/userobjectid/
USERPRINCIPALNAME: Returns the user principal name.
https://dax.guide/userprincipalname/
CUSTOMDATA: Returns the value of the CustomData connection string property if defined; otherwise, BLANK().
https://dax.guide/customdata/
USERCULTURE: Returns the culture code for the user, based on their operating system or browser settings.
https://dax.guide/userculture/