No CNAME even found for:
nslookup -q=ns _acme-challenge.mail.dhavenaar.nl nsn1.mijndomein.nl
Server: pdns107.ultradns.com
Address: 156.154.64.107
*** pdns107.ultradns.com can’t find _acme-challenge.mail.dhavenaar.nl: Non-existent domain
nslookup -q=TXT _acme-challenge.autodiscover.dhavenaar.nl nsn1.mijndomein.nl
Server: pdns107.ultradns.com
Address: 156.154.64.107
*** pdns107.ultradns.com can’t find _acme-challenge.autodiscover.dhavenaar.nl: Non-existent domain