Posts from WordPress mobile blocked

I have created draft posts on my android mobile, which will normally be uploaded to my main site at https://www.tenfoottwo.co.uk. I now find that the posts from my mobile are being blocked, even though Cerber recognises the IP address (I am at home and using the same router for both mobile and PC access). It keeps displaying:

Login failed
URL: tenfoottwo.co.uk/xmlrpc.php

This was working fine before so I do not understand what has changed and why I cannot now connect from my mobile.

The page I need help with: [log in to see the link]