Apex domains cannot have CNAME records.
Question and response
Question
dig quintex.com. NS
Answer
quintex.com. 5 NS phoenix.quintex.com.
quintex.com. 5 NS yoyo.quintex.com.
Authority
The response has no authority records.
Additional
yoyo.quintex.com. 5 A 23.130.104.2
phoenix.quintex.com. 5 A 23.130.104.1
yoyo.quintex.com. 5 AAAA 2620:7:6000:0:0:ffff:c759:df02
phoenix.quintex.com. 5 AAAA 2620:7:6000:0:0:ffff:c759:df01
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0