Support other non 443 port access HTTPS?

Website, Application, Performance Getting Started
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For example, my source server is https://www.promm.com:8443
However, access to https://www.promm.com:8443 occurs after Cloudflare is enabled: Error 525

There is no problem accessing the original server directly. 8443 is supported by Cloudflare, right?
https://support.cloudflare.com/hc/en-us/articles/200169156-Which-ports-will-Cloudflare-work-with-

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It definitely should be. If you haven’t already, please submit a support ticket from your account email address. You can do so at support.cloudflare.com.