This thread is resolved. Here is a description of the problem and solution.
Problem:
The client was trying to update the production license key after moving from staging to production but encountered an error stating that the site is still registered as a development site on WPML.org.
Solution:
If you're experiencing this issue, we recommend following these steps:
1. Unregister your site from being recognized as a development site by following the instructions here: How to remove the 'This site is registered on WPML.org as a development site' notice.
2. After unregistering, go to your WPML account and delete the old key as shown in your account screenshot.
3. Re-register your license for the production environment.
This solution might be outdated or not applicable to your specific case.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 the problem persists, please open a new support ticket.
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