Apex domains cannot have CNAME records.
Question and response
Question
dig ticfaced.uem.mz. NS
Answer
ticfaced.uem.mz. 3 NS dzowo.uem.mz.
ticfaced.uem.mz. 3 NS oceano.uem.mz.
Authority
The response has no authority records.
Additional
oceano.uem.mz. 167934 A 196.3.96.69
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0