I tried to set this up, but you don’t seem to have DNS configured appropriately, so we could not provision SSL for that new hostname.
It seems like you use cloudflare to terminate that hostname, and it returns an HTTP 301 for that hostname, rather than proxying to the netlify site which it would need to do to allow SSL to be generated.
You’ll have to work with Cloudflare’s tech support on why that is happening, as we are not Cloudflare experts (plus, we don’t even provide tech support on the configuration you are using, if you proxy to us via cloudflare):