When we open Monitor ---> Network Services and then go to "Non SD-WAN Destinations via Gateway", we won't see any NSD via gateway listed there.
However, in Configure ---> Network Services we do see the NSD via gateways.
VMware SDWAN Orchestrator
Affected VCO version :- 6.0.0.1
The tunnelMode parameter is missing from some NSD via Gateways which is causing this UI issue.
Hence, we will see error "TypeError: Cannot read properties of undefined (reading 'forEach')" in browser console.
Workaround is doing a small / minor change in the affected NSD via Gateways and then saving the change will add the missing tunnelMode parameter to the NSD via gateway configuration. For example, changing the NSD via Gateway name and then saving it or changing tunnel mode and then saving. We can revert back the changes after issue is fixed.