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DNS_ERROR_CNAME_COLLISION
DNS_ERROR_CNAME_COLLISION means a CNAME record already occupies the target owner name and conflicts with the record the operation is trying to create. The resolution is a DNS data-model decision, not a retry.
What to check
- Inspect the existing CNAME and the intended new record at the same owner name.
- Decide which name should be canonical and which should remain an alias.
- Update dependent clients and automation before removing a production alias.
Get-DnsServerResourceRecord -ZoneName "contoso.com" -Name "alias"Microsoft: Get-DnsServerResourceRecord
Microsoft: DNS architecture, SOA, and authoritative zones
Microsoft: DNS logging and diagnostics
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