VxRail: Error while setting up the VLAN for validation: Failed creating network to test

An error is seen while setting up the VLAN for validation and adding nodes to a VxRail Cluster. "Failed creating network to test"
Three new PowerEdge nodes were to be added to a five node cluster with four Quanta nodes and one PowerEdge.

VxRail Hosts
Validate
Validation Errors
Error while setting up the VLAN for validation
Failed creating network to test.
Disk group validation
Failed to get disk information from hosts: {0}.

Marvin.log

[MARVIN] 2021-09-08T23:31:05.979+0000 ERROR [SimpleAsyncTaskExecutor-1] com.emc.mystic.manager.commons.component.tasklet.validation.ExpansionVlanLiveValidationTasklet ExpansionVlanLiveValidationTasklet.useVmotionTcpIpStack:300 - Unable to get entity of host.
com.vce.commons.core.exception.ConnectionException: com.sun.xml.ws.fault.ServerSOAPFaultException: Client received SOAP Fault from server: The object 'vim.HostSystem:host-24483' has already been deleted or has not been completely created Please see the server log to find more detail regarding exact cause of the failure.
[MARVIN] 2021-09-08T23:31:06.047+0000 ERROR [SimpleAsyncTaskExecutor-1] com.emc.mystic.manager.commons.services.network.SimpleHostNetworkConfig SimpleHostNetworkConfig.removePortgroup:291 - Failed removing portgroup vMotion on host
com.vmware.vim25.NotFoundFaultMsg: The object or item referred to could not be found.
[MARVIN] 2021-09-08T23:30:22.666+0000 ERROR [SimpleAsyncTaskExecutor-1] com.emc.mystic.manager.commons.component.tasklet.ConfigurationTasklet ConfigurationTasklet$1.onError:89 - Attempt 2/1 failed
[MARVIN] 2021-09-08T23:31:05.979+0000 ERROR [SimpleAsyncTaskExecutor-1] com.emc.mystic.manager.commons.component.tasklet.validation.ExpansionVlanLiveValidationTasklet ExpansionVlanLiveValidationTasklet.useVmotionTcpIpStack:300 - Unable to get entity of host.
[MARVIN] 2021-09-08T23:31:05.989+0000 ERROR [SimpleAsyncTaskExecutor-1] com.emc.mystic.manager.commons.component.tasklet.validation.ExpansionVlanLiveValidationTasklet ExpansionVlanLiveValidationTasklet.lambda$runTests$0:224 - Failed creating networks to test vlan connectivity.
[MARVIN] 2021-09-08T23:31:06.047+0000 ERROR [SimpleAsyncTaskExecutor-1] com.emc.mystic.manager.commons.services.network.SimpleHostNetworkConfig SimpleHostNetworkConfig.removePortgroup:291 - Failed removing portgroup vMotion on host
[MARVIN] 2021-09-08T23:31:56.841+0000 ERROR [SimpleAsyncTaskExecutor-1] com.emc.mystic.manager.commons.component.tasklet.validation.MatchingDiskTypeConfigurationValidationTasklet MatchingDiskTypeConfigurationValidationTasklet.validate:121 - Failed to get disks from any hosts in the cluster

ServerName:/home/mystic # tail -f /var/log/vmware/marvin/tomcat/logs/marvin.log | grep ERROR

[MARVIN] 2021-09-09T02:53:38.151+0000 ERROR [SimpleAsyncTaskExecutor-4] com.emc.mystic.manager.commons.c omponent.tasklet.ConfigurationTasklet ConfigurationTasklet$1.onError:89 - Attempt 2/1 failed

ServerName:/home/mystic # tail -f /var/log/mystic/web.log | grep ERROR

2021-09-09T02:56:48.462+0000 ERROR [SimpleAsyncTaskExecutor-5] org.springframework.batch.core.step.Abstr actStep AbstractStep.execute:237 - Encountered an error executing step customizedHostnameValidationStep in job expansionValidationJob
2021-09-09T02:56:51.213+0000 ERROR [myScheduler-10] com.vce.commons.core.connection.services.ConnectionF actoryImpl ConnectionFactoryImpl.createSSLHostConnectionWithInitialAccount:155 - Fail to connect to host : fe80::250:5xff:xxxx:xxx%eth1 with user: root
2021-09-09T02:57:02.751+0000 ERROR [myScheduler-10] com.vce.commons.core.connection.services.ConnectionF actoryImpl ConnectionFactoryImpl.createSSLHostConnectionWithInitialAccount:155 - Fail to connect to host : fe80::250:5xff:xxxx:xxx%eth1 with user: root 

marvin.log:

[MARVIN] 2021-09-09T03:45:21.302+0000 INFO  [SimpleAsyncTaskExecutor-6] com.emc.mystic.manager.commons.component.listener.ConfigurationActionStepExecutionListener MarvinConfigurationLog.beginTask:12 - [Task 6f02cb4d-e5ec-4f93-83e4-b291ac75e36a] START: Running action config.action.expansion.validation.host.name, stage validation_host
[MARVIN] 2021-09-09T03:45:21.302+0000 INFO  [SimpleAsyncTaskExecutor-6] com.emc.mystic.manager.commons.component.listener.ConfigurationActionStepExecutionListener MarvinConfigurationLog.updateTask:17 - [Task 6f02cb4d-e5ec-4f93-83e4-b291ac75e36a] UPDATE: This action will be tried 1 times
[MARVIN] 2021-09-09T03:45:21.309+0000 INFO  [SimpleAsyncTaskExecutor-6] com.emc.mystic.manager.commons.component.tasklet.validation.CustomizedHostnameValidationTasklet CustomizedHostnameValidationTasklet.getReplaceHostHostnames:110 - Found reserved hostname for node replacement : [] !
[MARVIN] 2021-09-09T03:45:21.313+0000 INFO  [SimpleAsyncTaskExecutor-6] com.emc.mystic.manager.commons.component.tasklet.validation.HostnameValidationTasklet HostnameValidationTasklet.validateVcPscHostnamesForExternalVc:386 - Validating VC server: vCenterName.company.com for joining external VC.
[MARVIN] 2021-09-09T03:45:21.313+0000 INFO  [SimpleAsyncTaskExecutor-6] com.emc.mystic.manager.commons.component.tasklet.validation.HostnameValidationTasklet HostnameValidationTasklet.validateVcPscHostnamesForExternalVc:409 - Validating PSC server hostname: null for joining external VC in non-embedded mode -
[MARVIN] 2021-09-09T03:45:21.313+0000 ERROR [SimpleAsyncTaskExecutor-6] com.emc.mystic.manager.commons.component.tasklet.ConfigurationTasklet ConfigurationTasklet$1.onError:89 - Attempt 2/1 failed

1. DNS names for PSC and vCenter in the Mystic database instead of IP addresses.
2. The config.json and config-journal.json show PSC name when system is at vSphere 6.7 and has an embedded PSC in vCenter.
3. The config.json and config-journal.json show the nonEmbeddedMode as false.