Hi,
you cannot directly use the vCD URL to launch a VM console, instead you should integrate the WebMKS SDK into your portal.
For reference: https://docs.vmware.com/en/VMware-vSphere/8.0/html-console-sdk-programming-guide/GUID-E5495E81-DAF4-4BEE-B66A-D3DD94B07596.html
Please also check compatibility between SDK and vCD.