Matrix Visual Display Top Domain by Count

StephenK,

Your measure is missing a CALCULATE for the COUNT expression in the variables vUserDomain and vAllDomain. Alternatively, you can use a measure, resulting in an implicit CALCULATE. The correct measures are below:

Domain Count = COUNT ( Domains[Domain] )

Top Domain = 
VAR vUser =
    MAX ( Users[UserId] )
VAR vUserDomain =
    ADDCOLUMNS (
        SUMMARIZE ( Domains, Domains[UserId], Domains[Domain] ),
        "DomainCount", [Domain Count]
    )
VAR vUserDomainRank =
    ADDCOLUMNS (
        vUserDomain,
        "DomainRank", RANKX ( vUserDomain, [DomainCount],, DESC, DENSE )
    )
VAR vUserTopDomainRow =
    FILTER ( vUserDomainRank, [DomainRank] = 1 )
VAR vUserTopDomain =
    MAXX ( vUserTopDomainRow, Domains[Domain] )
VAR vAllDomain =
    ADDCOLUMNS (
        SUMMARIZE ( Domains, Domains[Domain] ),
        "DomainCount", [Domain Count]
    )
VAR vAllDomainRank =
    ADDCOLUMNS (
        vAllDomain,
        "DomainRank", RANKX ( vAllDomain, [DomainCount],, DESC, DENSE )
    )
VAR vAllTopDomainRow =
    FILTER ( vAllDomainRank, [DomainRank] = 1 )
VAR vAllTopDomain =
    MAXX ( vAllTopDomainRow, Domains[Domain] )
RETURN
    IF ( HASONEVALUE ( Users[UserName] ), vUserTopDomain, vAllTopDomain )