Thank you for contacting WPML Support. It appears that you've registered WPML without "www" in your site URL, but your current site URL includes "www". Please follow the steps below to see if this resolves your issue:
1. Please login to your WPML account >> Go to the Sites page: https://wpml.org/account/sites/
2. Delete the existing dadco.net site keys.
3. Please login to your site and go to the Dashboard >> Plugins >> Add new > Commercial tab and click the ‘Unregister WPML from this site’ link if that link exists.
4. Then please click the ‘Register WPML’ link.
5. Click the ‘Get a key for this site’ link.
6. It will generate the Key for your site.
7. Copy the key paste it back to the input box and press the Register button.
8. Now, you can update the WPML plugins if needed.
If the “WPML plugin cannot connect to wpml.org” notification still exists after updating WPML plugins then please follow the below steps:
1. Please go to Dashboard Menu >> Updates.
2. Press the "Check again" link as you can see in the attached screenshot.
3. Now please go to the Plugins page and see if that notification still exists.