Invalid URL with proxy enabled

When enabling the Cloudflare proxy on the website URL www.designwindowsgroup.com, I receive an error “Invalid URL”. See screenshot below. If I change it to DNS only, the website works fine.

image

Any ideas?
Thanks

This is the information returned by your server. Is the corresponding domain name website unbound in the server?

By ‘unbound’, what do you mean. Web hosting/management/design isn’t normally my role.
DNS worked previously with the same configuration on a different names server. It also works fine if we don’t proxy the site (The orange cloud). We moved it here so we could get a certificate.

Quoting the web designers, the site is built using a static site generator, with a load balanced setup rather than a single server so there is no direct IP address.

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