This thread is resolved. Here is a description of the problem and solution.
Problem:
You are wondering if you need to activate your WPML license on a cloned staging site after migrating from a production site.
Solution:
After migrating, WPML will continue to function on your staging site. However, if you want to receive updates and test the latest version of WPML before updating the plugins on your live site, you will need to generate a new key specifically for your staging site. For guidance on how to unregister and register your site, please visit How to unregister and register.
If this solution does not apply to your situation, or if it seems outdated, we recommend opening a new support ticket. We also 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. For further assistance, please visit our support forum at WPML support forum.
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This topic is split from https://wpml.org/forums/topic/problem-creating-test-staging-site/