Simple enough formula to calculate number of days between two dates. Don't understand getting #VALUE error. My trouble-shooting skill are not so hot.

=IF(ISBLANK([@[Date Eligibility Review Complete]]),"",DAYS([@[Date Eligibility Review Complete]],[@[Date App Submitted]]))

A small sample file with some data ( no pibcs please) would help
Are your dates real dates ( right-aligned in cell when no manual alignment applied) or text looking like dates (left-aligned...)?

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