xmlrpc.php, .htaccess $ WP for Android

I have been struggling with this issue for a while now and need some help with it.

I have .htaccess enabled on my site so it’s necessary to log in first.
The WP for Android app, despite having my login credentials as well as my blog’s un/pw, does not work with .htaccess enabled.

After some correspondence via email with the app developers, they pointed me in this direction:

“In order to connect to your site, the app needs access to this file:

http://mysitename.com/xmlrpc.php

Can you adjust your .htaccess rules to allow access to that file?

Thanks,

Kevin M.
Happiness Engineer”

I have tried multiple variations of configuring the .htaccess to allow access to xmlrpc.php but nothing seems to work.
No matter what I do, the WP app can not access my site with .htaccess enabled.

I have the validator (https://github.com/daniloercoli/WordPress-XML-RPC-Validator) installed on another WP site so I can test accessibility for myself but I can’t seem to get the .htaccess config right.

Searching about xmlrpc.php and .htaccess usually leads to people wanting to block access to it, not allow it.

Thanks in advance.