This thread is resolved. Here is a description of the problem and solution.
Problem: User was not able to sync menus in WPML->WP Menus Sync Solution: The menu was created from categories terms, categories must be translated before we can sync the menu Relevant Documentation: https://wpml.org/documentation/getting-started-guide/translating-post-categories-and-custom-taxonomies/ https://wpml.org/documentation/getting-started-guide/translating-menus/
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This topic is split from https://wpml.org/forums/topic/language-switcher-not-working-wordpress-newspaper-theme/