Apex domains cannot have CNAME records.
Question and response
Question
dig pysio.online. NS
Answer
pysio.online. 4 NS hyperion.pysio.online.
pysio.online. 4 NS valkyrie.pysio.online.
Authority
The response has no authority records.
Additional
hyperion.pysio.online. 4 A 162.159.1.237
valkyrie.pysio.online. 4 A 162.159.3.228
hyperion.pysio.online. 4 AAAA 2400:cb00:2049:1:0:0:a29f:1ed
valkyrie.pysio.online. 4 AAAA 2400:cb00:2049:1:0:0:a29f:3e4
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0