Proxy issue

i have 2 domains to configure that I want to protect by proxying through Cloudflare. I have configured both the same but only 1 works
If I turn off Proxying, the client side browser resolves the ORIGIN Server and the site works perfectly.
If I turn on Proxying, the client side browser resolves Cloudflare and sends all traffic there
However, 1 of the sites gets a 404 when proxying is turned on.
I have checked that the ORIGIN server does not block Cloudflare IPs.
How can I resolve the problem where the ORIGIN Server works but when proxying it does not?
What other tests can I perform to work out where the problem is?

Welcome to the Cloudflare Communtiy.

Do you see the 404 errors in your origin server logs?

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