Getting "Is your License Server compatible?" after launching Citrix Studio.

 

If "Continue" button is selected then it will give the following error:

Error Id: XDDS:C266BBDF
Exception:
    Citrix.Console.Models.Exceptions.ScriptException The service instance is already registered with the Configuration Service.
       at Citrix.Console.PowerShellInteraction.CmdletExecutionMethods.CreateException[T](ICommonLog logger, ExecutionResults`1 results, ICmdletExecutionHost host)
       at Citrix.Console.PowerShellInteraction.CmdletExecutionMethods.ExecuteAndReturnRawResults(SdkPipeline sdkCmd, ICmdletExecutionHost host)
       at Citrix.Console.PowerShellInteraction.CmdletExecutionMethods.Execute(SdkPipeline sdkCmd, ICmdletExecutionHost host)
       at Citrix.Console.PowerShellSdk.UpgradeService.UpgradeTasks.ServiceConfigurationTask.RegisterServiceEndPoints(ServiceEndpointAnalysis servicesWithUnregisteredServiceInstance, ICmdletExecutionHost host, ITaskLogger taskLogger)
       at Citrix.Console.PowerShellSdk.UpgradeService.UpgradeTasks.ServiceConfigurationTask.<>c__DisplayClass21.<RunUpgradeTask>b__19(ICmdletExecutionHost host)
       at Citrix.Console.PowerShellInteraction.SimplePowerShellScript.<>c__DisplayClass4.<Run>b__3(ICmdletExecutionHost host)
       at Citrix.Console.PowerShellInteraction.SimplePowerShellScript.RunScript()
       at Citrix.Console.PowerShellInteraction.PowerShellScript`1.Run()
       at Citrix.Console.PowerShellSdk.UpgradeService.UpgradeTasks.ServiceConfigurationTask.RunUpgradeTask(IProgressReporter progressReporter, ITaskLogger taskLogger)
       at Citrix.Console.PowerShellSdk.UpgradeService.UpgradeTasks.UpgradeTaskBase.RunUpgrade(IProgressReporter progressReporter, ITaskLogger taskLogger)
       at Citrix.Console.PowerShellSdk.UpgradeService.UpgradeTasks.UpgradeTaskBase.RunUpgrade(IProgressReporter progressReporter, ITaskLogger taskLogger)
       at Citrix.Console.PowerShellSdk.UpgradeService.UpgradeTasks.Upgrade.RunUpgradeTask(IProgressReporter progressReporter, ITaskLogger taskLogger)
       at Citrix.Console.PowerShellSdk.UpgradeService.UpgradeTasks.UpgradeTaskBase.RunUpgrade(IProgressReporter progressReporter, ITaskLogger taskLogger)
       at Citrix.Console.DeliveryCenter.UI.Mmc.UpgradeResultPaneViewModel.UpgradeTask(IProgressReporter progressReporter, UserCredentials databaseCredentials)
       at Citrix.Console.CommonControls.ProgressDisplay.ProgressWindowOperation.PerformOperation()
       at Citrix.Console.CommonControls.ProgressDisplay.ProgressWindowViewModel.PerformAction(Action operationComplete)
    DesktopStudio_ErrorId : ServiceAlreadyRegistered
    ErrorCategory : NotSpecified
    DesktopStudio_PowerShellHistory : SimplePowerShellScript

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Solution 1:
Reboot all the Delivery Controllers in the site one by one

Solution 2:

• Close Citrix Studio
• Backup site database (precautionary step)
• Run the following commands in PowerShell on the DDC:

1. Add-PSSnapin *Broker*
2. Get-ConfigRegisteredServiceInstance -ServiceType "Broker" | Unregister-ConfigRegisteredServiceInstance

• Launch Citrix Studio and run the automatic upgrade

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Problem Cause

One or many service instances of Citrix Virtual Apps and Desktops services might not be registered with the Citrix Configuration Service. 

"The License Server Has Been Upgraded. Let Me Continue" Message In XenDesktop. XenDesktop 7.6 :getting an upgrade option in the console. If the click on Continue, they have the following error: Error Id: XDDS:C266BBDF.