Here's the snippet of the Session.log file where the error occurs. The QuotaNetwork warning is actually the cause of the error, and as stated above is due to missing oib data for the replica being failed over, not the NEA configuration. In looking at these entries with support, it seems the switch-friendly name and UUID are blank (hence the double space after "switch", and the vlan default value, in this case, is 0.
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[05.01.2021 08:24:17] <1820> Warning QuotaNetwork was not found for switch vlan 0
[05.01.2021 08:24:17] <1820> Info [ReplicaAlgLocker] Unlocking replica (SessionId='98b8184a-ec4a-4af5-bde7-9c94fff52005', LockId='df78c2c2-f85a-4fcf-9e65-1e954a3916d8')
[05.01.2021 08:24:17] <1820> Info [API] DestroyLease.Started, leaseId: [7f0330a4-cbe8-4ee9-a879-8c499aeac5d5]
[05.01.2021 08:24:17] <1820> Info [API] DestroyLease.Success, leaseId: [7f0330a4-cbe8-4ee9-a879-8c499aeac5d5]
[05.01.2021 08:24:17] <1820> Error Failed to prepare network extension appliance for failover (System.Exception)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.HyperV.CHvCloudApplianceFailoverAlg.Failover(CHvSnapReplicaVm snapReplicaVm, COib oib, CBaseSession session)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.CLocalFailoverJobAlg.Failover(COib oib)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.CloudService.CCloudFailoverManager.FailoverOib(Guid oibId, CCloudSessionManager sessionManager)
[05.01.2021 08:24:17] <1820> Error Failed to get replica networks info from infrastructure (System.Exception)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.CCloudFailoverApplianceAlgImpl.Failover(Guid objectId, Guid replicaId, IXmlLogger logger, ICloudApplianceOperator applianceOperator, CCloudFailoveredVmNetworking[] vmNetworkings, Boolean sourceVmHasNics)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.HyperV.CHvCloudApplianceFailoverAlg.Failover(CHvSnapReplicaVm snapReplicaVm, COib oib, CBaseSession session)
[05.01.2021 08:24:17] <1820> Error Failed to prepare network extension appliance for failover (System.Exception)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.HyperV.CHvCloudApplianceFailoverAlg.Failover(CHvSnapReplicaVm snapReplicaVm, COib oib, CBaseSession session)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.CLocalFailoverJobAlg.Failover(COib oib)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.CloudService.CCloudFailoverManager.FailoverOib(Guid oibId, CCloudSessionManager sessionManager)
[05.01.2021 08:24:17] <1820> Error Failed to get replica networks info from infrastructure (System.Exception)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.CCloudFailoverApplianceAlgImpl.Failover(Guid objectId, Guid replicaId, IXmlLogger logger, ICloudApplianceOperator applianceOperator, CCloudFailoveredVmNetworking[] vmNetworkings, Boolean sourceVmHasNics)
[05.01.2021 08:24:17] <1820> Error at Veeam.Backup.Core.HyperV.CHvCloudApplianceFailoverAlg.Failover(CHvSnapReplicaVm snapReplicaVm, COib oib, CBaseSession session)
[05.01.2021 08:24:18] <213> Error Cloud Connect failed to perform VM failover (System.Exception)
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CCloudFailoverManager.FailoverOib(Guid oibId, CCloudSessionManager sessionManager)
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CCloudServerFailoverInvoker.FailoverOib()
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CCloudServerFailoverInvoker.Invoke()
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CAsyncOperation.DoInternal()
[05.01.2021 08:24:18] <213> Error --- End of stack trace from previous location where exception was thrown ---
[05.01.2021 08:24:18] <213> Error at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CAsyncOperation.GetInvokerState()
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CAsyncInvokeExecutor.GetInvokerState(CAsyncOperation operation, Exception& exception)
[05.01.2021 08:24:18] <213> Error --- End of stack trace from previous location where exception was thrown ---
[05.01.2021 08:24:18] <213> Error at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CAsyncInvokeExecutor.GetState(Guid asyncId)
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CCloudServerSpecInvoker.RequestTaskResult(CCloudSessionAccessor accessor, COutputXmlData request, CInputXmlData response, CCloudServiceTaskResult& taskResult)
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CCloudServerSpecInvoker.InvokeInternal(CCloudSessionAccessor accessor, COutputXmlData request, CInputXmlData response)
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CCloudServerSpecInvoker.Invoke(CCloudSessionAccessor accessor, COutputXmlData request, CInputXmlData response)
[05.01.2021 08:24:18] <213> Error at Veeam.Backup.CloudService.CSocketInvokerServerProtocol.InvokeCommand()