This thread is resolved. Here is a description of the problem and solution.
Problem:
The client needs urgent assistance with registering their live site with a new WPML license key.
Solution:
If you're experiencing this issue, we recommend you follow these steps after ensuring a full site backup (mandatory):
1. Visit your account page at https://wpml.org/account/sites/
2. Delete the existing key for your site.
3. Navigate to Plugins>>Add New>>Commercial tab on your site dashboard.
4. Click on "Unregister WPML from this site".
5. Refresh the page.
6. Click on "Get a key for this site".
7. Copy the newly generated code.
8. Return to Plugins>>Add New>>Commercial tab.
9. Register the site with the new key.
For more detailed instructions, please refer to our documentation: https://wpml.org/faq/how-to-remove-the-this-site-is-registered-on-wpml-org-as-a-development-site-notice/
If this solution does not apply to your case, or if it seems outdated, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent fix, and confirming that you have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. Should you need further assistance, please open a new support ticket at WPML support forum.
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This topic is split from https://wpml.org/forums/topic/existing-pages-are-already-translated-but-trying-to-charge-full-transaction/