Just checked on Mac - this works:
(switches tabs in Safari)
switchApp("Safari")
wait(1)
type(Key.TAB, Key.CTRL)
wait(2)
type(Key.TAB, Key.CTRL + Key.SHIFT)
wait(2)
So it might be, that according to some "convention" for you key combination it is
type("i", Key.SHIFT + Key.CMD)
on Mac
Just checked on Mac - this works:
(switches tabs in Safari)
switchApp("Safari")
wait(1)
type(Key.TAB, Key.CTRL)
wait(2)
type(Key.TAB, Key.CTRL + Key.SHIFT)
wait(2)
So it might be, that according to some "convention" for you key combination it is
type("i", Key.SHIFT + Key.CMD)
on Mac