Apex domains cannot have CNAME records.
Question and response
Question
dig tommybookingsupport.com. NS
Answer
tommybookingsupport.com. 5 NS anycast-eu.dns.sqr.nl.
tommybookingsupport.com. 5 NS anycast-global.dns.sqr.cloud.
tommybookingsupport.com. 5 NS unicast-eu.dns.sqr.domains.
Authority
The response has no authority records.
Additional
anycast-global.dns.sqr.cloud. 5 A 194.58.198.57
anycast-global.dns.sqr.cloud. 5 AAAA 2a01:3f1:3057:0:0:0:0:53
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0