Need to create a shift (days off) calendar in matrix visualisation - overlaid with vacations

If you change the isOff measure to...

isOff = 
var _employee = 
SELECTEDVALUE(vacationTable[Name])
var _shiftEffectDate = 
MINX(shift_table, shift_table[EffectiveDate])
var _modValue = 
MINX(shift_table, shift_table[DaysOn]) + MINX(shift_table, shift_table[DaysOff])
var _comparisonValue = 
MINX(shift_table, shift_table[DaysOn])
var _testValue =
Value(SELECTEDVALUE(dimDate[Date]) - _shiftEffectDate)
var _mod =
MOD(_testValue, _modValue)
var _shiftName = 
"#FFB6C1"//MINX(shift_table, shift_table[Name])
var _testDate = 
SELECTEDVALUE(dimDate[Date])
var _offCount = 
COUNTROWS(FILTER(vacationTable, vacationTable[Name] = _employee && vacationTable[Date] = _testDate))
Return
IF(
    _testValue >= 0,
    IF(_mod>=_comparisonValue,_shiftName,IF(_offCount>0,"#fed70d" ,"")),
    ""
)

You will end up with...