Speechbubble commands only work with @, but you’re correct about the zoom command. 
@MelaniaArgona I suggest a few things 1) share your story link with a friend so they can test it to see if it’s off-screen for them. 2) Test it with another device if you have one. 3) use the @speechbubble reset command and see if that changes anything at all. 4) If nothing works and it seems all hope is lost… submit a support ticket.