Load Balancer - Mystery 404s

Hi all,
I have created a CloudFlare load balancer: https://ml-inference-lb.photoninsights.com/
It points to two origins:
The healthcheck for origin 1 is 🟢 because it is up.
However, when I visit https://ml-inference-lb.photoninsights.com/v2/health/live, I get a mystery 404.
In fact, all requests to the LB just give 404.

I must be missing something simple here.. Can anyone pls help? 🙏

EDIT: Perhaps because origins are HTTPS? Could this be an issue?
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