Need only three authors and then et al in AMA

Hi
I am pretty new to the Zotero world and need my references to only appear as first 3 authors and then followed by et al for more than 3 author names.
I already tried to fix the code under citations to et-al-min="4" et-al-use-first="3" and changed the style title and ID but it doesn't seem to work?
Not sure if I am missing something but any help would be greatly appreciated!
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