Paginated report dataset from Power BI DAX query

Use the @ symbol for a parameter and make sure it's mapped in the parameters section.

Here's a simplified example based on your query:

DEFINE
    VAR CountryFilter = TREATAS ( { @Country }, 'DimLocation'[Country] )
EVALUATE
SUMMARIZECOLUMNS (
    'DimLocation'[Country],
    'Action'[Control],
    CountryFilter,
    "CountRowsFactAction", CALCULATE ( COUNTROWS ( 'Action' ) )
)

More detail in my answer here: https://stackoverflow.com/questions/68820105