Siri won't send text messages
I've been trying to send text messages on an Apple Watch connected to an iPhone 5S, both running the latest OS at the time of writing. iMessage is disabled.
If I open the messages app on the watch and dictate a message then it will send. I can also reply to messages on the watch. If I use Siri on the phone along the lines of "Hey, Siri, send a message to #{contact} saying #{message}" then I will be presented with buttons for cancelling and sending; selecting send does what one might expect. But, the same command to Siri on the watch results only in a "don't send" button and the message is never sent. Can anyone suggest what this might be, and how I might fix it, please? The ability to send a message by voice only is a critical feature.