Cloudflare SSL issuer unrecognized on a subdomain error - PLEASE HELP

Pls help.
On the domain dubai-realty.com - the SSL is working perfectly well
On a subdomain download.dubai-realty.com - it shows error - the issuer of SSL certificate is unrecognized also it was issued by Cloudflare - please help to resolve

Issued here -

The general rule applied to both main domain and subdomain

Origin certificates are only used to secure the connection between Cloudflare and your Origin. They can only be used on hostnames that are proxied, or :orange: in the DNS tab of the dashboard.

Either proxy the hostname, or get a valid certificate from a CA like Let’s Encrypt for your origin.

Thank you, Michael - after i Proxied the connection

It stopped opening the website completely =(

Can you please advise?

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