Background of the issue:
I am trying to update the core WPML plugin and all add-ons. The issue can be seen at: hidden link
Please respond to this email address as well: barrygirsh@gmail.com
Symptoms:
Connection failed! Please refresh the page and try again. (Unable to register: Site key not matching)
Questions:
Why is the WPML plugin unable to connect to wpml.org?
How can I resolve the site key not matching error?
Please respond to this email address as well: barrygirsh@gmail.com
Thank you for contacting WPML Support. This issue usually happens when the site URL and registered site URL are not the same e.g. with www or without www. Could you please delete the existing site key and create a new one by following the below steps:
1. Please login to your WPML.org account >> Go to the Sites page: https://wpml.org/account/sites/
2. Delete the existing site key.
3. Please login to your site and go to the Dashboard >> Plugins >> Add new plugin > 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, and paste it back into the input box, and press the Register button.
8. Then, please take a backup of your site and update WPML plugins.
If the “WPML plugin cannot connect to wpml.org” notifications still persists, please try the below procedure:
1. Go to WP Dashboard Menu >> Updates.
2. Press the "Check again" link as you can see in the attached screenshot and see if this resolves the issue.