Error 522 issue

Hi all,
I just switched to Cloudflare my domain, but it’s not working, it keeps giving me error 522.
It is my home server, with and Home Assistant Installation, the server is behind the external router and a second wifi router.
If I connect using my public IP I can access it. If I use my subdomain, it gives me error 522.
I’ve checked my installation but IPTABLES si void and I have no .htaccess.

What it can be then?

Probably some forwarding issue.

But If I try using the public IP the forwarding works.

Are you comfortable posting the IP here?

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