Re-assign Scom agents to new Gateway server

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  We have 2 SCOM 1807 management servers, and 45 SCOM Gateway server installed at various customers.
  At a few customers we will install a new windows 2016 Scom Gateway server, and the current Windows 2012 gateway server will temporarily function as the failover gateway server
  I found a script from the famous Kevin.
  https://kevinholman.com/2018/08/06/assigning-gateways-and-agents-to-management-servers-using-powershell/
  
  I'm a powershell beginner, so with some help i tweaked the script for our situation.
  I get a popup, and can select one or multiple agents to assign the primary and failover gateway server. Configured this already for a few customers

  $oldGW = "GW01.domain.com"
  $newGW = "GW02.domain.com"
   
  # Get Management Server Object Examples
  $Primary = Get-SCOMManagementServer | where {$_.Name -eq $newGW} 
  $Failover = Get-SCOMManagementServer | where {$_.Name -eq $oldGW}
   
  # Get all agents currently assigned to a Management Server or GW
  #$Agents = Get-SCOMAgent -ManagementServer $Failover
   
  $Agents = Get-SCOMAgent -ManagementServer $Failover | Out-GridView -Title "Select the SCOM agents you want to set the management server for." -PassThru
  
  # Reassigning all agents in an array of agents
  ForEach ($Agent in $Agents)
  {
                 [string]$AgentName = $Agent.DisplayName
                 $PriBefore = $Agent.GetPrimaryManagementServer().DisplayName
                 $FailBefore = $Agent.GetFailoverManagementServers().DisplayName
                 If ($FailBefore) 
  			   {
  # We need to remove any failover settings for this agent in case we are setting a primary server already in the failover list
      Write-Host "Removing Failover...."
                                Set-SCOMParentManagementServer -Agent $Agent -FailoverServer $null
                 }
                 If ($FailBefore -ne $Failover) {
                                Set-SCOMParentManagementServer -Agent $Agent -PrimaryServer $Primary
                                Set-SCOMParentManagementServer -Agent $Agent -FailoverServer $Failover  
                 }
  }
  Write-Host SCOM agents $Agents.DisplayName had their Primary Management set to $NewGW. -ForegroundColor Green

  But now i need  to remove the failover gateway server from all clients.
  The bold part is the only thing I changed in the script
  

  If ($FailBefore -ne $Failover) {
                                Set-SCOMParentManagementServer -Agent $Agent -PrimaryServer $Primary
                                Set-SCOMParentManagementServer -Agent $Agent -FailoverServer $Null 

  But is doesn't work.. I don't get a popup, and failover server is still configured on the agents..

  What am i doing wrong?

  Thanks

  Saturday, March 14, 2020 8:47 AM