filtering a CUBESET

[1_bit_wonder]

Im trying to filter a cubset based on a secondary column

I have a dataset with many columns but the 2 of interest or Company_Name (text) and Charity (yes/No)

i want to get a list of Company_Names that are charities so far i have

=CUBESET(
    "ThisWorkbookDataModel",
    "FILTER(
        [Base_Data].[Company_Name].children,
        [Base_Data].[Charity].CURRENTMEMBER.MEMBER_VALUE = true
    )",
    "Filtered Company Names"
)

but when i try and get a count it comes back as 0 (Should be > 6)

=CUBESETCOUNT(Q6)

If i take the filter and the charity line out i get the full list. Im close i just cant get past the finish line.

I'd appreciate any help