Get-ADUser splatting error

Hello,

i'm trying to use splatting for a GET-ADUser but from some reason it doesn't work

$GetADUserParameters = {
        Identity = "username"
        Properties = "employeeid, manager, notes"
}
Get-ADUser @GetADUserParameters


Get-ADUser : Cannot evaluate parameter 'Identity' because its argument is specified as a script block and there is
no input. A script block cannot be evaluated without input.
At line:6 char:12
+ Get-ADUser @GetADUserParameters+            ~~~~~~~~~~~~~~~~~~~~+ CategoryInfo          : MetadataError: (:) [Get-ADUser], ParameterBindingException+ FullyQualifiedErrorId : ScriptBlockArgumentNoInput,Microsoft.ActiveDirectory.Management.Commands.GetADUser



$Error[0] |fl * -Force


PSMessageDetails      :
Exception             : System.Management.Automation.ParameterBindingException: Cannot evaluate parameter
                        'Identity' because its argument is specified as a script block and there is no input. A
                        script block cannot be evaluated without input.
                           at
                        System.Management.Automation.Internal.PipelineProcessor.SynchronousExecuteEnumerate(Object
                        input, Hashtable errorResults, Boolean enumerate)
                           at System.Management.Automation.PipelineOps.InvokePipeline(Object input, Boolean
                        ignoreInput, CommandParameterInternal[][] pipeElements, CommandBaseAst[] pipeElementAsts,
                        CommandRedirection[][] commandRedirections, FunctionContext funcContext)
                           at
                        System.Management.Automation.Interpreter.ActionCallInstruction`6.Run(InterpretedFrame
                        frame)
                           at System.Management.Automation.Interpreter.EnterTryCatchFinallyInstruction.Run(Interpre
                        tedFrame frame)
TargetObject          :
CategoryInfo          : MetadataError: (:) [Get-ADUser], ParameterBindingException
FullyQualifiedErrorId : ScriptBlockArgumentNoInput,Microsoft.ActiveDirectory.Management.Commands.GetADUser
ErrorDetails          :
InvocationInfo        : System.Management.Automation.InvocationInfo
ScriptStackTrace      : at <ScriptBlock>, <No file>: line 6
PipelineIterationInfo : {}