It might be because Meta iOS app is handling some of that handoff and its not possible to do these action purely via the BT api? It seems like in the end they recognize if that had an iOS app they could accomplish some of their wishlist items. However, there are other valid critiques here.
Seems to be correct, according to [0] the user needs to link the Meta View app with WhatsApp, not sure if the link is then made on the cloud or on the local device...:
"Use the Meta View app to connect Ray-Ban Stories and Ray-Ban Meta smart glasses to WhatsApp on your phone."
