Apex domains cannot have CNAME records.
Question and response
Question
dig kraemer-it.cloud. NS
Answer
kraemer-it.cloud. 5 NS glen.ns.cloudflare.com.
kraemer-it.cloud. 5 NS val.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
val.ns.cloudflare.com. 3 A 108.162.192.234
val.ns.cloudflare.com. 3 A 172.64.32.234
val.ns.cloudflare.com. 3 A 173.245.58.234
glen.ns.cloudflare.com. 3 A 108.162.193.169
glen.ns.cloudflare.com. 3 A 172.64.33.169
glen.ns.cloudflare.com. 3 A 173.245.59.169
val.ns.cloudflare.com. 3 AAAA 2606:4700:50:0:0:0:adf5:3aea
val.ns.cloudflare.com. 3 AAAA 2803:f800:50:0:0:0:6ca2:c0ea
val.ns.cloudflare.com. 3 AAAA 2a06:98c1:50:0:0:0:ac40:20ea
glen.ns.cloudflare.com. 3 AAAA 2606:4700:58:0:0:0:adf5:3ba9
glen.ns.cloudflare.com. 3 AAAA 2803:f800:50:0:0:0:6ca2:c1a9
glen.ns.cloudflare.com. 3 AAAA 2a06:98c1:50:0:0:0:ac40:21a9
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0