Cloudflare is blocking my API

I offer an API from my URL. I have never had an issue with customers accessing the API from their own domain’s until recently 1 customer simply cannot connect. The customer gave me access to his site to test this further and I get 404 errors every time the API is accessed with all kind of Cloudflare stuff being shown. It seems Cloudflare is blocking access for this one domain to my API.

How can I make sure the customer’s site is whitelisted?

I looked through my Firewall Events and don’t see anything related to his site listed.

Note: I am on the free version.

Firewall wouldn’t give a 404. A 404 actually comes from the origin server. Have you checked those logs?

Can you post a screenshot of this?

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