Formula for excel is not working in google docs

This formula is not working in google docs but does work in excel. Any reasons why?

=SUM(COUNTIFS(A4:S32,"WAC",B4:T32,{"RTC","PHP"}))

I can't say why it doesn't work in Google Docs (I'm not familiar with it)

But that is not really a standard use of either of those functions, but it's a neat little trick that works in Excel.
But it's basically just a shortcut for countifs+countifs.

So in google docs, try
=COUNTIFS(A4:S32,"WAC",B4:T32,"RTC")+COUNTIFS(A4:S32,"WAC",B4:T32,"PHP")

I suspect it's because of the array element contained in your formula ({"RTC","PHP"}).

Jonmo1's solution should work though.

I've seen other posts about google docs where they have to use a function called ArrayFormula (or something like that)

So maybe you need to do
=ArrayFormula(SUM(COUNTIFS(A4:S32,"WAC",B4:T32,{"RTC","PHP"})))