I had this same problem initially.
First you should copy the index.php file from:
https://www.mysite.com/app/wp
to:
https://www.mysite.com/users/wp
Then, edit the template of the index.php file. In the line right at the top under “don’t remove this line”, change:
require(‘../app/wp/wp-blog-header.php’);
to read:
require(‘../users/wp/wp-blog-header.php’);
These changes are specific to the two URLs you supplied. Other configurations would obviously require the paths to be specified differently. In my case, it was to simply change the path to:
require(‘./wp/wp-blog-header.php’);
…which I suspect is a more generic example… The index.php at the top level of the domain, with all the WP files located within ./wp/
Hope this helps someone else, even if you’ve fixed your problems long ago…
-db