Will addCNAME
app.example.com
edge.acme.dev
Serve your site
Already setTXT
_acme.app.example.com
acme-verify=7f3a
Prove ownership
ConflictCNAME
app.example.com
edge.acme.dev
A CNAME cannot share a name with the existing A record.
Will removeTXT
_acme.app.example.com
acme-verify=7f3a