OutboundType UserDefinedRouting is incompatible with Node Public IP in AKS

Title

If nodes are not registering as expected in an AKS cluster, you may encounter errors similar to this when scaling virtual node groups:

Could not scale up for pending pod podname-agent-77429fbcd44-qtmxp due to technical failure to launch required instances. Scale down has been disabled in the cluster until pod is scheduled.

and

Failed to perform scale up for virtual node group vngname (vng-3d9f1f79). Got status code different from SC_OK : 400 Body { "code": "UDRWithNodePublicIPNotAllowed", "details": null, "message": "OutboundType UserDefinedRouting can not be combined with Node Public IP.", "subcode": "" }

This indicates a configuration conflict between outboundType and node public IP settings.

Review the cluster configuration and check if enableNodePublicIP is set to True.
This setting is not compatible with an outboundType of userDefinedRouting.
Update the cluster configuration to set enableNodePublicIP to False.

For detailed steps, refer to Microsoft's documentation: Configure outbound type for AKS.

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Case id: 00001065