NETWORKDAYS() Holiday question

Recently discovered the NETWORKDAYS() function, I have a question regarding the usage of the Holidays parameter of the function. We have our holiday table setup like so:

I am getting the following error when injecting the holidays into the NETWORKDAYS() formula: "The expression refers to multiple columns. Multiple columns cannot be converted to a scalar value."

FieldTAT = 
    VAR vStartDate = 'WF'[InspectionDate]
    VAR vEndDate = MAX('WF'[ReportReceivedDate], TODAY())
    VAR vHolidays =
        FILTER(
            'Holidays',
            'Holidays'[Country] = 'WF'[Country]
            && 'Holidays'[Date] >= vStartDate && 'Holidays'[Date] <= vEndDate
        )

    RETURN
    SWITCH(
        TRUE(),
        'WF'[WeekendType] = 3, NETWORKDAYS(vStartDate, vEndDate, 6, vHolidays), // THU/FRI
        ...
        NETWORKDAYS(vStartDate, vEndDate, vHolidays)
    )

My error is obviously with how I am trying to use the holiday table here so is there a way to fix this?

Another question is, is there a way to add a custom weekend identifier? According to the KB, there is no weekend identifier for Fri+Sun as the weekend. We are currently calculating our TAT using a custom calendar that is not the most optimized solution:

VAR vCalendar = CALENDAR(MIN(vStartDate, vEndDate), MAX(vStartDate, vEndDate))
    VAR vWeekdays = ADDCOLUMNS(vCalendar, "Weekday", WEEKDAY([Date]))

    VAR vTAT = 
        IF(vStartDate = vEndDate, 0,
            SWITCH(
                TRUE(),
                'WF'[WeekendType] = 2, COUNTX(FILTER(vWeekdays, AND([Weekday] <> 6, [Weekday] <> 7)), [Date]) - 1, // Fri, Sat
                'WF'[WeekendType] = 3, COUNTX(FILTER(vWeekdays, AND([Weekday] <> 5, [Weekday] <> 6)), [Date]) - 1, // Thu, Fri
                'WF'[WeekendType] = 4, COUNTX(FILTER(vWeekdays, AND([Weekday] <> 6, [Weekday] <> 1)), [Date]) - 1, // Fri, Sun
                ...
            )
        )