Not able to install OCP 4.12 in Azure with custom network/DNS

Customer has it's own/existing DNS name used for the installation, Customer has deployed the same using install-config in past[1+ year] with their own IP and DNS.  

Install a cluster on 4.12 Azure

1. Created install-config.yaml as per the attachment.
2. Try to install OCP 4.12.17 on Azure

Failed to write CNAME 
Failed to perform 'write' on resource(s) of type 'dnszones/CNAME', because the parent resource '/subscriptions/xxx-xxxx-xxxx-xxxxx-xx/resourceGroups/xxx-xxxx/providers/Microsoft.Network/dnszones/xxxxxx.net' could not be found.\""

Note : We have sanitized the resource group and DNS domain name. Same we can see in the openshift logs.

OCP 4.12 Cluster should be install successfully with custom/existing/external DNS 

Some addition Links:

Customer is performing the installation for OCP 4.12 using with same install-config but in past OCP 4.8 was able to install using the same install-config.yaml.

Attached install-config.yaml and openshift-install.logs for more details:
[+] https://drive.google.com/drive/folders/1ctElwWj76VcNeuoXXKN8UouvldASWcMf?usp=sharing 

[1] https://docs.openshift.com/container-platform/4.9/networking/dns-operator.html#nw-dns-operator-managementState_dns-operator
[2] https://docs.openshift.com/container-platform/4.9/release_notes/ocp-4-9-release-notes.html#ocp-4-9-networking-dns-management-state
[3] https://docs.openshift.com/container-platform/4.12/installing/installing_azure/installing-azure-customizations.html