Thanks for the reply. My settings are quite generic:
define(‘WP_FAIL2BAN_BLOCK_USER_ENUMERATION’, true);
define(‘WP_FAIL2BAN_BLOCKED_USERS’, [‘admin’, ‘another’, ‘user’, ‘administrator’]);
define(‘WP_FAIL2BAN_LOG_PASSWORD_REQUEST’, true);
define(‘WP_FAIL2BAN_LOG_PINGBACKS’, true);
I have the same issue on two identically built websites.