Display Alerts False (not working on Mac computer)

Hi --

I have a code that I'm trying to make Mac compatible, and one of the functions in th ecode is to remove dupicates.
When on a PC it works perfectly, but on a mac, a dialogue box pops up to asking that we 'ok' the column list for the remove duplicates function.

Is there a way to have this alert not pop up when running on a mac (it already doesn't if on a PC).

The code begins with 'Application.DisplayAlerts = False', so I'm wondering whether there's an equivalent/different function I should be using if the user is on a Mac.

Thanks!