I may have found a clue to my ajax issue.
admin-ajax.php file not found error is still present at https://andyeulau.com/wp-admin/admin-ajax.php
However, I have wordpress installed in it’s own directory. If I use the true url, including the directory that I have all of my wordpress file in, then I do indeed get the 0 output from admin-ajax.php.
Is it possible that I need to “tell” responsive-contact-form about my directory structure?
It may be a WP installation issue, as I have similar subdirectory installations with clients that do output 0.
Any further considerations are much appreciated.
Best,
ae2bass