Additional Filter to TRICKY DAX

[Invesco]

Hi Experts

How would i apply an addtional filter to the following DAX

Measure =
  VAR __Table = FILTER('eda_edetailing_slides_used', [drmf_clm_presentation_slide_id] <> BLANK())
  VAR __Column1 = SELECTCOLUMNS(__Table,"__Column",[crm_call_name])
  VAR __Column2 = SELECTCOLUMNS(__Table,"__Column",[crmf_hcp_id])
RETURN
  COUNTROWS(DISTINCT(UNION(__Column1, __Column2)))

 Filter

eda_edetailing_slides_used[activity_type_1] IN {"f2f", "Virtual"}))

[johnt75 · Accepted solution]

MyMeasure =
VAR __Table =
    FILTER (
        'eda_edetailing_slides_used',
        NOT ( ISBLANK ( [drmf_clm_presentation_slide_id] ) )
            && eda_edetailing_slides_used[activity_type_1] IN { "f2f", "Virtual" }
    )
VAR __Column1 =
    SELECTCOLUMNS ( __Table, "__Column", [crm_call_name] )
VAR __Column2 =
    SELECTCOLUMNS ( __Table, "__Column", [crmf_hcp_id] )
RETURN
    COUNTROWS ( DISTINCT ( UNION ( __Column1, __Column2 ) ) )