Olivier

Problem:
The client migrated to a new host provider and encountered issues with WPML plugins not working due to the site key not being validated. This issue arose because the domain name default changed with the new web host provider.
Solution:
We recommended the following steps to resolve the site key validation issue:
1. Perform a full site backup.
2. Navigate to your account page at https://wpml.org/account/sites/
3. Delete the existing site key.
4. Go to Wp-Admin -> Plugins -> Add New -> Commercial tab.
5. Click on "Unregister WPML from this site".
6. Refresh the page.
7. Click on "Get a key for this site" and copy the newly generated code.
8. Return to Wp-Admin -> Plugins -> Add New -> Commercial tab and register the site with the new key.
9. Check if the issue persists.

The client's lifetime license allows registering multiple sites without additional costs for new site keys.

If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have installed the latest versions of themes and plugins. If further assistance is needed, please open a new support ticket at WPML support forum.