Apex domains cannot have CNAME records.
Question and response
Question
dig tmw-shield.com. NS
Answer
tmw-shield.com. 5 NS ns-02.t-w.dev.
tmw-shield.com. 5 NS ns-01.t-w.dev.
Authority
The response has no authority records.
Additional
ns-01.t-w.dev. 5 A 85.215.34.119
ns-01.t-w.dev. 5 A 93.90.202.210
ns-01.t-w.dev. 5 A 193.47.99.3
ns-01.t-w.dev. 5 A 213.239.242.238
ns-02.t-w.dev. 5 A 194.164.51.78
ns-02.t-w.dev. 5 A 194.164.60.120
ns-02.t-w.dev. 5 A 213.133.100.103
ns-01.t-w.dev. 5 AAAA 2001:67c:192c:0:0:0:add:a3
ns-01.t-w.dev. 5 AAAA 2a01:4f8:0:a101:0:0:a:1
ns-01.t-w.dev. 5 AAAA 2a0e:b107:27d0:2:0:0:0:2
ns-02.t-w.dev. 5 AAAA 2a01:4f8:0:1:0:0:5ddc:2
ns-02.t-w.dev. 5 AAAA 2a0e:b107:27d0:2:0:0:0:3
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0