Redirects won't work when proxying Zendesk Help Centre


So I’m trying to do some 301 redirects on a Zendesk help centre (because they don’t support it).

We currently have Cloudflare setup as DNS only and I’ve got the Bulk Redirects set up in a list that’s active.

When I “orange cloud” the subdomain, none of the redirects function on the subdomain yet on our root domain they work fine.

Any advice/tips?

Cname settings:

Here’s an example that’s not working:

Should bounce to:

Any help appreciated. I’m 99% sure it’s something to do with the subdomain setup, or maybe that Zendesk also use Cloudflare, but I’m not sure where to diagnose from here.