This thread is resolved. Here is a description of the problem and solution.
Problem:
You are experiencing an error after moving your site from staging to production, with a message indicating that WPML detected a new address for the site, although the address has not changed.
Solution:
We recommend ensuring that each site version (staging and production) has a unique site key. During the migration process, you should select the 'copy' option on the migration banner. However, it is crucial to generate a new site key for the production site.
If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your specific case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the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. Additionally, please feel free to open a new support ticket with us for further assistance at WPML support forum.
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