IFERROR in Dax

Formatting Excel formula from this post for the reader:

=IFERROR(
    IF(
        VLOOKUP(
            M4285,
            'Revenue Category Lookup'!$D:$G,
            2,
            FALSE
        ),
        Q4285 & "-" & M4285,
        "MISSING SPLIT BY"
    ),
    IFERROR(
        IF(
            VLOOKUP(
                K4285,
                'Revenue Category Lookup'!$D:$G,
                3,
                FALSE
            ),
            Q4285 & "-" & K4285,
            "MISSING SPLIT BY"
        ),
        IFERROR(
            IF(
                VLOOKUP(
                    I4285,
                    'Revenue Category Lookup'!$D:$G,
                    4,
                    FALSE
                ),
                Q4285 & "-" & I4285,
                "MISSING SPLIT BY"
            ),
            Q4285 & "-" & S4285
        )
    )
)