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Problem:
The client is unable to register their site with WPML due to a site key not matching, despite previous successful registrations.
Solution:
We recommend checking if different URLs are being used for the home and main URLs. You should generate a WPML key for each URL version, as this might resolve the issue. If you're experiencing this, you can find a helpful screenshot in our support forum or directly view the image here.

Please note that this solution might be outdated or not applicable to your specific case.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 issue persists, please open a new support ticket.