jQuery.accordion isn’t a function even when enqueued

The 3rd parameter in the call to wp_register_script() should be an array of dependencies – not a string.

Change this:

wp_register_script('fl-custom-js', get_template_directory_uri() . '/faq/faq.js', 'jquery-ui-accordion', '', true);

To:

wp_register_script('fl-custom-js', get_template_directory_uri() . '/faq/faq.js', array('jquery-ui-accordion'), '', true);

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