LUA - Hammerspoon - Loop - eventtap keeps triggering

Question

I'm trying to write a fairly simple script for Hammerspoon where I am looping through a table of app windows. The problem is for some reason when I call hs.eventtap inside the loop it keeps firing.

Any help much appreciated

function toggleMute()
    local teams = hs.application.find("com.microsoft.teams"):allWindows()

    if not (teams == null) then
        for i, v in pairs(teams) do
            hs.eventtap.keyStroke({"cmd", "shift"}, "m", 0, v)
        end
    end

    hs.alert.show('Mute Toggled')
end