Chatty is often seen as a new device to verify
I use Chatty with Matrix. When I use the Element Matrix client it shows many times Chatty under Unverified Devices.
It looks like that Chatty sessions are seen as a new devices. Maybe Chatty is seen as a new device each time when Chatty is started, or when the Librem5 is restarted or something like that.
Verifying Chatty works, but soon after it, it is reported as a new device again.