Apex domains cannot have CNAME records.
Question and response
Question
dig 134.19.194.in-addr.arpa. NS
Answer
134.19.194.in-addr.arpa. 4 NS dns102.telia.com.
134.19.194.in-addr.arpa. 4 NS dns2.telia.com.
134.19.194.in-addr.arpa. 4 NS dns49.de.telia.net.
134.19.194.in-addr.arpa. 4 NS dns101.telia.com.
Authority
The response has no authority records.
Additional
dns2.telia.com. 4 A 81.228.10.67
dns49.de.telia.net. 4 A 213.248.77.82
dns49.de.telia.net. 4 AAAA 2001:2030:c000:5:0:0:0:4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0