Filter Based on another table

Here is the matrix visual I am creating. The problem is that my measure for Next Milestone Budget is returning blanks.

Here is the model view of the tables in question to create this visual. ProjectID comes from #Success - Project List, - Next Milestone Due Date is a measure based in DimMilestone, relying on only data from that table.

Here is the DAX for Next Milestone Budget. Milestone Date VAR is the same code to generate - Next Milestone Due Date in the visual above.

Budget comes from #Support - Tasks, but I need to filter that table based on the next milestone date.

If I leave out that second filter in the calculate, I get a sum of all budget points for the project of the task type I'm filtering for. But when I try to add the filter for Milestone, it returns all blanks.

- Next Milestone Budget = 
VAR 
MilestoneDate = 
    CALCULATE(
        MIN(DimMilestone[EndDate]),
        DimMilestone[MilestoneStatus] = "Pending"
    )

RETURN 
CALCULATE(
    SUM('#Support - Tasks'[TaskBudget]),
    '#Support - Tasks'[TaskType] = "Software Minor Update",
    '#Support - Tasks'[MilestoneEndDate] = MilestoneDate
)

Any help would be appreciated, thanks very much in advance.