Ajax.php site theme panel unable to change

I am unable to update the theme panel settings because of the below error I saw while updating the WordPress theme settings. Forbidden You don’t have permission to access /wp-admin/admin-ajax.php on this server.

Can someone please advise me on what I have to do for this?
ngix server with cloudflare

This is not a Wordpress forum or a general technical support site, there are better places for such things.

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