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This thread is resolved. Here is a description of the problem and solution.
Problem: I'm trying to activate the extended translation editor. After clicking on Sync translator and translation manager, I always get the following error message: AMS - Api error missing resource: Website not found validate site identifier
Solution: Check the AMS control panel (https://ams.wpml.org/panel/websites) and make sure that the website registered here is the correct one. If the link is not the right one, open a ticket and we'll take care of the needed changes.