Thank you for contacting WPML support. While you are waiting for one of my colleagues to take this ticket and work on it, let me provide you with the first debugging steps and try to help with the issue quickly.
You should go here (https://wpml.org/account/sites/) > remove the current key > generate a new key that will NOT be set as dev site > copy the new key > go to your website's backend > Plugins > Add new > Commercial > unregister WPML from the dev key and register WPML with the new key.