WordPress Ajax – looping data into a table

Have you actually added this action through functions.php?

This might be of interest for you:
https://developer.wordpress.org/reference/hooks/wp_ajax_action/

in your case the php function needs to be added as a hook:
add_action('wp_ajax_fetch_data', 'DisplayInfo')
add_action('wp_ajax_nopriv_fetch_data', 'DisplayInfo')

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