Secret variables are not replaced

[miriamgroeneveld]

When trying to replace as password with a secret variable, the tokenization step fails:
When changing the variable to plain text, tokenization works as expected.

2019-01-22T08:24:26.4900817Z Temp File: D:\Centric\Key2Zaken\DevKey2Zaken\Suite4Zaken\www\Tasks.Service\appsettings.json.tmp
2019-01-22T08:24:26.4900960Z
2019-01-22T08:24:26.4901046Z
2019-01-22T08:24:26.4901192Z Token DATABASEPASSWORD2
2019-01-22T08:24:26.4901295Z
2019-01-22T08:24:26.4901381Z
2019-01-22T08:24:26.5133123Z ##[error]System.Management.Automation.RemoteException: DATABASEPASSWORD2 variable not set
2019-01-22T08:24:26.5143418Z at System.Management.Automation.Runspaces.PipelineBase.Invoke(IEnumerable input)
2019-01-22T08:24:26.5143713Z at System.Management.Automation.PowerShell.Worker.ConstructPipelineAndDoWork(Runspace rs, Boolean performSyncInvoke)
2019-01-22T08:24:26.5144018Z at System.Management.Automation.PowerShell.Worker.CreateRunspaceIfNeededAndDoWork(Runspace rsToUse, Boolean isSync)
2019-01-22T08:24:26.5144324Z at System.Management.Automation.PowerShell.CoreInvokeHelper[TInput,TOutput](PSDataCollection1 input, PSDataCollection1 output, PSInvocationSettings settings)
2019-01-22T08:24:26.5144645Z at System.Management.Automation.PowerShell.CoreInvoke[TInput,TOutput](PSDataCollection1 input, PSDataCollection1 output, PSInvocationSettings settings)
2019-01-22T08:24:26.5145252Z at Microsoft.TeamFoundation.DistributedTask.Handlers.LegacyVSTSPowerShellHost.VSTSPowerShellHost.Main(String[] args)
2019-01-22T08:24:26.5321670Z ##[error]LegacyVSTSPowerShellHost.exe completed with return code: -1.
2019-01-22T08:24:26.5334846Z ##[section]Finishing: Tokenization: Transform file appsettings.json