Specific subdomain not reachable


I’ve got a simple setup with my domain, with the root and wildcard subdomain pointing to the same IP address (both A and AAAA) and my webserver redirects every subdomain to the root domain.

lastname.com →

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Furhter, I have got some records for my M365-hosted exchange server. That includes TXT and CNAME records, one for lastname.com and one for firstname.lastname.com.

Now, my issue is that, when I try to access the http(s) page with literally any subdomain the DNS will resolve to the server’s IP address, EXCEPT firstname.lastname.com which results in DNS_PROBE_FINISHED_NXDOMAIN or no answer in nslookup.

Why’s that especially this subdomain won’t be resolved?

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