Password security

You can try this snippet:

add_filter( 'woocommerce_min_password_strength', 'custom_password_strength', 100 );
function custom_password_strength( $strength ) {
  // 3 strong = default, 2 medium, 1 weak or anything
  return 2;
}

WooCommerce uses “3” by default, so something in your setup is changing it to “1”. Have a look in your theme’s functions.php. Or it could be in your theme – ask theme support. Check your theme’s settings. If you can find the snippet that changes the password strength form “3” to “1” just delete it.

Password strength is calculated by several factors, not just the number of characters, so you’ll not be able to set it to 12 characters. Your choices are strong, medium or weak.

There are password plugins with additional features, but if you can set the strength to “2” or “3” I think you will be satisfied.