Bad Request: Error occurred in the backing network provider: This API is not supported in the context of a Project., error code 524223
VMware Cloud Director 10.5.x
While migrating a provider gateway to use IP Spaces, we check for all the service IPs for all the connected edge gateways. If an edge gateway is backed by a VDC which is using projects (networking tenancy), the L2VPN/IPSEC VPNs API's are not supported on NSX T versions.
This is a know issue affecting VMware Cloud Director 10.5.x
Currently, there is no resolution.