CF-Connecting-IP header missing

I am currently setting up a Cloudflare tunnel with Traefik and am having troubles with the CF-Conecting-IP request header. I need this header to figure out the visitor's IPs for one of my services, but it is completely missing. I have not messed with the Cloudflare settings and have made sure that the internal IP of cloudflared is trusted for forwarded headers on both Traefik and my other service. It does display some CF- headers, but not the one I need. You can see for yourself, that the header is missing, by visiting whoami.knoll-family.de (I am going to remove this URL when this is solved). Do you have any clue as to why this header might be missing?
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