Harvard referencing and commas

I need to use Harvard referencing for my essay and have Cite Them Right 12th Edition installed. When I insert the citation via Zotero, this is the style that appears - (Gomez, 1997).
However in the reference guide from my institution, it should look like this - (Gomez 1997, p.193) with the comma appear after the year plus a page number.
Can someone explain why this is the case and how I can update Zotero to insert the citations in the style I have been asked to use?
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