Apex domains cannot have CNAME records.
Sophos
Domain verification
sophos-domain-verification=003edcfa3bdb224ed46c29f47c509e2962c6a99776d8a5e60145db55807c3889
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Zone apex
Start of authority
Email
Serial
2012073736
Refresh
1h
Retry
15m
Expire
7d
Negative cache TTL
1m