QUIC.cloud CDN and xmlrpc.php

Hello,

QUIC.cloud CDN is incompatible with connecting to the xmlrpc.php for a self-hosted WordPress blog.

Connecting to xmlrpc.php is a must, for example, to connect Ulysses text editor to WordPress:

https://ulysses.app/integrations/wordpress

Any ideas on how to make xmlrpc.php connection valid whilst QUIC.cloud CDN is active?

Many thanks!