I tried a Let’s Encrypt certificate and also a Cloudflare origin certificate.
Also i tried a Let’s Encrypt certificate for “api.fv.gbldev.ch” and “api2.fv.gbldev.ch” with the same result.
Access by browser also doesn’t work.
How am i supposed to setup my ssl certificates to use the proxy function by Cloudflare?
The Cloudflare universal certificates cover example.com and *.example.com.
This means that it covers any subdomain one level above the domain you signed up with. It will cover www.example.com and subdomain.example.com, as these are one level above the root domain, example.com. The certificate will not cover www.subdomain.example.com or a.b.example.com, however, as these subdomains are too deep.