Website proof failing but proof is live

I'm unable to get my website proof to succeed via either the desktop app or terminal.
My proof is live here: https://lillypip.co.uk/.well-known/keybase.txt
I'm able to view the file via Chrome and Firefox, so it seems publicly accessible, but Keybase reports my site as unreachable.

Terminal message:

Keybase UI:

This is a Wordpress site; I've tried proving with the keybase.txt in a number of locations: root, .well-known/, public_html/, public_html/.well-known/, but nothing works.
(File is currently in .well-known/)

I've searched and read a bunch of similar issues here, but I haven't found a solution.

Thank you!
Lilly

Start by reproducing the proof failure with the website URL and the current .well-known/keybase.txt location, using both the terminal and desktop app paths mentioned in the report. Compare the reported behavior with the accessible file and determine what would make the proof succeed for this WordPress site; done means the website proof completes successfully.

Written by the indexing model from the issue text.