Issues with ISINSCOPE

[insightD]

I am computing values in Power Bi using the ISINSCOPE function but not getting the expected result in my total.

As the image above shows, my values come out correctly in rows but not in the group total or grand total.
I have a measure like so:

Planned Session Duration = 
  IF (
   ISINSCOPE( DeltaRoom[DeltaRoomCode] ) && ISINSCOPE( xDate[Date] ),
  CALCULATE( MAX( 'Isinscope'[PlannedSessionDuration] ) ), -- get the max planned session duration for this scope
     IF (
         ISINSCOPE( Consultant[ConsultantKey] ) && ISINSCOPE( xDate[Date] ),
         CALCULATE( MAX( 'Isinscope'[PlannedSessionDuration] ) ), -- get the max planned session --duration for this scope
          IF (
                ISINSCOPE( Agency[AgencyName] ) && ISINSCOPE( xDate[Date] ),
                CALCULATE( MAX( 'Isinscope'[PlannedSessionDuration] ) ), -- get the max planned session duration for this scope
                 VAR _PlannedSession =
                   SUMMARIZE( 
                       'Isinscope',
                       'Isinscope'[Date],
                       "PlannedSessionDuration", MAX( 'Isinscope'[PlannedSessionDuration] ) -- get the max value for the scope 
                   )
                   RETURN 
                        SUMX(  _PlannedSession, [PlannedSessionDuration] )  -- return the sum of the max value from the variable to get the total 
          )
   )
)

Not sure where I am getting it wrong. What I hope to achieve is to get the MAX value of PlannedSessionDuration for each row. The MAX value of each row should be summed up as the total per group in the scope so Efficiency is computed like so:

 Efficiency = 
       DIVIDE(
       [Planned Duration(Mins)],
      [Planned Session Duration]
   )

I have attached the file here(.pbix and data file) 

I really appreciate any help you can provide.

[lbendlin]

xDate[Date]  is never in scope as it is not shown in the visual. Therefore always only the last formula is executed.