Getting Syntax Error: Invalid Token, Line 3, Offset2, .

Hi roger360 ,
Here’s a corrected version of your measure:

TopTeam = 
VAR TopTeamTable =
    ADDCOLUMNS(
        SUMMARIZE(
            FILTER(
                Table15924,
                NOT(ISBLANK(Table15924[Redirection to?]))
            ),
            Table15924[Redirection to?]
        ),
        "Count", CALCULATE(COUNTROWS(Table15924))
    )
VAR MaxCount = MAXX(TopTeamTable, [Count])
RETURN
    CALCULATE(
        FIRSTNONBLANK(Table15924[Redirection to?], 1),
        FILTER(TopTeamTable, [Count] = MaxCount)
    )