521 Site Down When Trying to Use LetsEncrypt/Nextcloud

So, I’ve been trying to get my Nextcloud to work with a reverse proxy. I bought a domain on godaddy, then brought it over to Cloudflare for hosting and wildcard SSL authentication. Everything is set up correctly in DuckDNS, LetsEncrypt and Nextcloud. When I click the web UI it’s going to my subdomain I’m trying to use. However, it constantly says 521 gateway down. I’m so close, but I have no idea how to proceed. If anybody could help, it would be greatly appreciated.

Also, this is my first post. So be gentle ;).

Thanks ahead of time.

‘521 Gateway down’ is not a Cloudflare error.

Would you mind telling us the domain?

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