The second storefront cannot be added to server group. Reinstallation and Reset Storefront cannot solve the issue.
StoreFront verbose log has the error below:
00000953 11:29:50 AM [5444] [SetFolderOwnerStep] Setting: NT Service\CitrixSubscriptionsStore as owner of folder: C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Citrix\SubscriptionsStore
00000954 11:29:50 AM [5444] Step: 9 of type: Citrix.DeliveryServices.Framework.Deployment.Steps.SetFolderOwnerStep FAILED
00000955 11:29:50 AM [5444] System.Exception: SetSecurityDescriptor: C:\Windows\ServiceProfiles\NetworkService\AppData\Roaming\Citrix\SubscriptionsStore (1307)
00000956 11:29:50 AM [5444] at Citrix.DeliveryServices.Framework.Deployment.Steps.SetFolderOwnerStep.SetOwner(DirectoryInfo directory, NTAccount account)
00000957 11:29:50 AM [5444] at Citrix.DeliveryServices.Framework.Deployment.Steps.SetFolderOwnerStep.Execute(IDictionary`2 notUsed)
00000958 11:29:50 AM [5444] at Citrix.DeliveryServices.Framework.Deployment.FeatureDeployment.Execute()
00000959 11:29:50 AM [5444] Exception Data: