EDIT: I’m an idiot and gave it the wrong email address originally. Literally took me digging into plugin code (PHP is not my strong suit) and wondering “where is it getting my email address?” Leaving the below message intact in case anyone else has a similar lapse of common sense!
I input the correct API key, see the red ‘x’, and never get to choose between my lists. Above, I see these warnings:
Warning: simplexml_load_string(): Entity: line 1: parser error : Start tag expected, ‘<‘ not found in /home/[username]/public_html/wp-content/plugins/mad-mimi-wp/providers/madmimi/functions.php on line 25
Warning: simplexml_load_string(): Unable to authenticate in /home/[username]/public_html/wp-content/plugins/mad-mimi-wp/providers/madmimi/functions.php on line 25
Warning: simplexml_load_string(): ^ in /home/[username]/public_html/wp-content/plugins/mad-mimi-wp/providers/madmimi/functions.php on line 25
I’ve regenerated my API key to no avail. I tried deactivating all other plugins and the issue persisted. I also tried it on a local install and it worked fine.