This thread is resolved. Here is a description of the problem and solution.
Problem:
You are trying to activate a site key on a live website after moving it from a development environment. You have received a new site key from your customer but are unsure where to enter it.
Solution:
We recommend checking the following documentation on how to update your site key after moving your website from development to live: How to remove the 'This site is registered on wpml.org as a development site' notice.
If this solution does not apply because it is outdated or not relevant to your specific case, we highly recommend opening a new support ticket. Additionally, please check related known issues at https://wpml.org/known-issues/, verify the version of the permanent fix, and confirm that you have installed the latest versions of themes and plugins. For further assistance, you can also visit our support forum at WPML Support Forum.
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