DatesYTD returns Blank for first month

I'm hoping that someone here has seen this before and can advise what is going on.

The DAX pasted below is to figure out the Revenue for the last financial year. The Financial Year runs from 1 July to 30 June. As in the screen shot below July presents no data - Blank - and I do not understand why.

Screen shot below shows the output from the DAX.

This screen shot shows the date table and that FY 2019 does indeed have the correct number of days.

_Revenue TY test = 
VAR fiscalYear = [Fiscal Year TY]
VAR reportMonthStart = CALCULATE(FIRSTNONBLANK('Date'[Date], 1), ALL('Date'), 'Date'[Fiscal Year] = fiscalYear)
VAR reportMonthEnd = CALCULATE(LASTNONBLANK('Date'[Date], 1), ALL('Date'), 'Date'[Fiscal Year] = fiscalYear)
VAR TFYDatesBetween = DATESBETWEEN('Date'[Date], reportMonthStart, reportMonthEnd)
        VAR DateFilterYTD =
            INTERSECT (
                DATESYTD ( 'Date'[Date], "30 June" ),
                TFYDatesBetween
            )
RETURN
    CALCULATE (
                SUM(EVO_DMT_BUS_CUST_PROFIT_VW[_Revenue]), 
                'Date'[Date],
                DateFilterYTD
               )

I don't have a test case to upload at this time, sorry. The main data set is 19 million rows and 270+ MB of data... and financial ... etc etc etc...

And I'm not using TOTALYTD, etc... it's been a nightmare.