vCloud Director 10 unable to register with Usage Meter 3.6.1 HP3

I had a issue registering vCloud director 10 with Usage Meter 3.6.1 HP3

Error : Service Unavailable

•  Checked on the compatibility guide the versions  is supported
• Port 443 is open even (customer had a firewall between them but firewall doesn’t seems to be a issues)

Found out there is know issue with vCloud director v10. If you disable the provider access to the legacy API login endpoint, all API integrations that rely on the system administrator login stop working, including vCloud Usage Meter and vCloud Availability for vCloud Director

Workaround:

• Re-enable the service provider access to the legacy /api/sessions  endpoint by using the cell management tool.
• To enable the provider access to the /api/sessions API endpoint, run the following command on the vCloud Direcotor
• /opt/vmware/vcloud-director/bin/cell-management-tool manage-config -n vcloud.api.legacy.nonprovideronly -v false

Below are some documentation for your perusal

https://docs.vmware.com/en/vCloud-Director/10.0/rn/VMware-vCloud-Director-for-Service-Providers-100-Release-Notes.html#knownissues    -->    vCloud Director 10.0 for Service Providers Release Notes

https://docs.vmware.com/en/vCloud-Director/10.0/com.vmware.vcloud.install.doc/GUID-84390C8F-E8C5-4137-A1A5-53EC27FE0024.html   -> Disable the Service Provider Access to the Legacy API Endpoint