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Problem:
If you're experiencing an error when attempting to register your site with the WPML plugin key, it might be due to a firewall blocking WPML.
Solution:
We recommend contacting your hosting provider and requesting them to whitelist the following domains:

• wpml.org
• cdn.wpml.org
• api.wpml.org
• api.toolset.com
• cloudfront.net

For more details, please see our documentation on this issue: WPML Plugin Cannot Connect to WPML.org.

If this solution does not resolve your issue or seems irrelevant due to being outdated or not applicable to your case, we highly recommend checking related known issues at https://wpml.org/known-issues/, verifying the version of the permanent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. Additionally, you can open a new support ticket for further assistance at WPML Support Forum.