_spf.vwgroup.com has no CNAME records.
Question and response
Question
dig _spf.vwgroup.com. NS
Answer
The response has no answer records.
Authority
vwgroup.com. 5349 SOA ns1.volkswagen.de. dns.volkswagen.de. 2021082399 86400 7200 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0