These warnings can be safety ignored. Our serial number format is different than the format used by BIND which is the most popular DNS server, but it doesn’t impact anything as we don’t replicate our DNS to other systems. And the recommended range for the SOA is just that… a recommendation. We’re aware of the recommendation but chose a different value.
I’m not sure which query gave you DNS record not found.
You don’t have DMARC record and hostly probably don’t want or need one.