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You are using a custom DNS server "10.81.0.4" and not Azure Provided DNS "168.63.129.16" for default DNS queries.
Can you please let me know where this server "10.81.0.4" is hosted?
Depending on that, you have various options here.
- If this is hosted in Azure, then you have to create a conditional forwarder for the zone "database.windows.net" and forward it to Azure Provided DNS "168.63.129.16"
- In case this is hosted in OnPrem,
- You will be required to use a DNS Forwarder deployed into Azure
- And make the OnPrem DNS server forward requests for "database.windows.net" to this Azure custom DNS server
- Configure this Azure custom DNS server to further forward it to Azure Provided DNS "168.63.129.16"
- Refer : Workloads using a DNS forwarder
In case you don't want to deploy a custom DNS server in Azure, you can consider Azure DNS Private Resolver
Kindly let us know if this helps or you need further assistance on this issue.
Thanks,
Kapil
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