Return Unique values from concat two columns

Hi katyfailoo 

please try

Combined Values =
CALCULATE (
    CONCATENATEX (
        DISTINCT (
            SELECTCOLUMNS (
                FILTER ( 'Table_A', 'Table_A'[Key] IN VALUES ( 'Table_B'[Key] ) ),
                "@_1", 'Table_A'[Column_1],
                "@_2", 'Table_A'[Column_2]
            )
        ),
        [@_1] & " - " & [@_2],
        ";" & UNICHAR ( 10 ),
        [@_1], ASC
    ),
    ALL ( 'Table_A' )
)

Thank you so much! tamerj1 this solution works. Can't thank you enough for your time and help!