infinite scroll not working when logged out

add this before your other add_action call:

add_action('wp_ajax_nopriv_zephyr_infinite_scroll', 'zephyr_get_nextpage');

the wp_ajax_ filter runs only when you are logged in. wp_ajax_nopriv_ runs only when logged out. This is so you can separate your requests, and maybe treat them differently, if that’s the case.

Check wp_ajax_(action)

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