DAX SummarizeColummns() and AddMissingItens() error

Hi, guys!

I think it's a simple error but I couldn't solve it. 

I need to know how many customers purchased two specific products in the month, such as Coke and Pepsi, filtered by Sector.

I did it in 3 steps. Fist I did a SUMMARIZECOLLUMN, then GROUPBY and finally COUNTX.

When I do it in DAX Studio works fine, but when I put it in a table that contains the Key_Sector column  doesn't.

What am I doing wrong?

Qualified Purchase = 

VAR Table1 =
ADDCOLUMNS(
SUMMARIZECOLUMNS(
    Clientes[Key_Sector],
    Produtos[Product],
    Clientes[Key_Client],
    KEEPFILTERS( TREATAS( {"COKE","PEPSI"}, Produtos[Product] ))),
    "Qtd", [PDV | Cobertura]
)

VAR Table2 =
FILTER(
	GROUPBY(Table1, [Key_Sector], [Key_Client], "Cob", SUMX(CURRENTGROUP(), [PDV | Cobertura])),
[Cob] = 2 )

RETURN
COUNTX(Table2, [Key_Sector])