Microsoft Word Blog Post with xmlrpc

I am trying to configure Microsoft Word (office 365) to create blog posts on a wordpress website.

I have followed https://www.php.net/manual/en/xmlrpc.installation.php

I have ensured that my VPS server has the php-xmlrpc extension installed in apache…running php -w in putty ssh command line shows the above extension in the list.

I have ensured that the directory I am trying to post to is correct…

https://mydomain.com/wordpress/xmlrpc.php

the username is my wordpress admin login and I have checked to make sure this is correct (by logging into wordpress directly…all good)

I have ensured that https://ftp.mydomain.com A record is setup at registrar (yep done)
I have checked my ftp user is working on the server by logging into ftp using FileZilla (all good)

one small thing I note here…the ftp user for the server is not the same as the admin user I log into wordpress dashboard with. Is this a problem?

On the MS Word side of things I am having all sorts of problems.

I am not sure which protocols Word is using to upload the blog post to wordpress. Is it going through html or is it using ftp? It appears that there are 3 possibilities – http, ftp, mail?

I am not sure which user to input, or whether or not I need to also create an ftp user on the server for the wordpress admin user?