SUMIF with multiple dates across columns without duplicating

Need a formula that can sum the [Incremental Sales Forecast] column if the columns [Initial Sales Presentation]:[Verbal Agreement] has a date in any cell and without duplicating if several cells have dates.

=SUMIFS({Reference Range (Incremental Sales Forecast)}, {Reference Range ([Initial Presentation]:[Verbal Agreement])},ISDATE(@cell)

Above formula doesn't work, does if the second range is only one column, need it to read across all four.

Any suggestions? @Andrée Starå @Paul Newcome

Likely simple to fix, and just not seeing it.

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