Subdomain redirect loop

We have a service with dot.vu whereby a widget is hosted on a subdomain of sub.domain.com but they are having a redirect loop

when I access https://sub.domain.com/ and inspect the network requests, I can see that Cloudflare is replying with a 301 Moved Permanently but then provides the exact same location.

I have created a CNAME record as well as ensuring that SSL/TLS is set to full

We do have a page rule set, however turning this off doesn’t rectify the issue

sub.domain.com/*
Forwarding URL (Status Code: 301 - Permanent Redirect, Url: https://sub.domain.com/$1)

Afraid that’s an insecure legacy mode, set that to Full Strict for starters and check if that fixed the issue.

Still getting the issue, but thanks for the advice!

Are you sure? It works here

$ curl -I REDACTED
HTTP/2 404

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