When configuring a VMware HCX Mobility Group for virtual machine migration, newly created Distributed Port Groups in the destination VMware Cloud Foundation (VCF) environment are not visible in the network selection list.
VMware HCX 9.1.0.0
VMware Cloud Foundation (VCF) 9.1
The new Distributed Port Groups are associated with the destination vCenter and Distributed Virtual Switch (VDS), not the legacy vCenter environment where they were expected by the HCX Mobility Group configuration.
NOTE:
If you don't see the new port group under NSX, you should be able to see it under Vcenter
Select the vCenter to see all portgroups that are configured