I just tried on Sonoma and it too didn't work.
Turned on and off. Disconnected and reconnected the cable.
Quit all apps that could have been using the camera and left it for about 10-15 minutes.
Tried again, it worked. I could see the remote shooting screen.
Will now try on Sequoia.
I've been seeing that connection modal for many months now sometimes it still works despite the message.
