Complex DAX Statement based on existence in Dim; FTE based so sometimes sum and sometimes don't

I think I've came close;

Staff Calculation = 
VAR StaffData =
    ADDCOLUMNS (
        SUMMARIZE ( Fact, Fact[DateID], Fact[TimeID], Fact[CostCenterID], Fact[FloorID], Fact[OccupationID] ),
        "@Staff", 
            VAR StaffValue = 
                CALCULATE ( 
                    MAX ( Occupation[StaffNeeded] ), 
                    FILTER ( Occupation, Occupation[OccupationID] = Fact[OccupationID] )
                )
            RETURN IF ( ISBLANK(StaffValue), "Error", StaffValue )
    )

VAR MaxPerDay =
    ADDCOLUMNS (
        SUMMARIZE ( StaffData, Fact[DateID], Fact[CostCenterID], Fact[FloorID] ),
        "@MaxStaff", MAXX ( FILTER( StaffData, Fact[DateID] = EARLIER(Fact[DateID]) && Fact[CostCenterID] = EARLIER(Fact[CostCenterID]) && Fact[FloorID] = EARLIER(Fact[FloorID]) ), [@Staff] )
    )

VAR FinalCalculation =
    SUMX ( MaxPerDay, [@MaxStaff] )

RETURN FinalCalculation

This outputs this; 

Almost what I need I think, but I only expected a textmessage on the Type A 20250102 on the morning, because the MAX is indeed 3, but there is also a value which can't be found on the dim so it should be a textmessage instead.

Any suggestions here?