Can't set setprop activebordercolor gradient

Hi.

If I do a single color like hyprctl dispatch setprop active activebordercolor “rgb(180,142,173)” it works, but when when I add another color:

hyprctl dispatch setprop active activebordercolor “rgb(180,142,173) rgb(142,180,149)” it no longer works.

Same thing when I do with hex ARGB.

I checked the docs, seems like the syntax is correct, whats the problem here?