"Share" button is greyed out for "Routed" NSX-T Network in Organization Virtual DataCenter.
VMware Cloud Director 10.5.X and Later
The Edge Gateway for the "Routed" network has not been added to the Data Center Group in that tenant.
To resolve the issue, add the Edge Gateway to the respective Data Center Groups where you want to share the "Routed" network:
Without Sharing Edge Gateway to data Center Group, "Routed" NSX-T Network could not be Shared.
The networks are "Routed" via Edge Gateway hence Edge Gateway to be shared.