Ah I just tried to load that site and my browser didn’t resolve it. Is the domain registered / resolving to a website yet?
Also querying the domain via google’s DNS did not resolve anything either :
dig @8.8.8.8 -t a www.samuelauer.com
; <<>> DiG 9.10.6 <<>> @8.8.8.8 -t a www.samuelauer.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 12817
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 512
;; QUESTION SECTION:
;www.samuelauer.com. IN A
;; AUTHORITY SECTION:
samuelauer.com. 1799 IN SOA dns1.p03.nsone.net. hostmaster.nsone.net. 1570621567 43200 7200 1209600 3600
;; Query time: 59 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Fri Oct 11 08:24:41 EDT 2019
;; MSG SIZE rcvd: 112
For you to register with the CDN, the domain has to exist and resolve to a functioning site. I’ll look into why an error response wasnt more informative in your case however this is likely the reason why it wont register for you.