"Edge gateway XXXX cannot be connected to more than 9 non-distributed networks " error when we attempt add a network to an existing edge
VMware Cloud Director 10.x
In NSX-T, the Tier-1 gateway downlink or service interfaces can reach up to 1000 interfaces per Tier-1 gateway.
Use the cell management tool command to increase the limit.
/opt/vmware/vcloud-director/bin/cell-management-tool manage-config -n networking.gatewayInterfaceCount -l
/opt/vmware/vcloud-director/bin/cell-management-tool manage-config -n networking.gatewayInterfaceCount -v xx
Note: the default for this configuration option is 10