Powershell - Multiple Sets of Parameter Sets

Consider these parameters:

        [parameter(Mandatory = $true)]
        [string[]]$UserId,

        [parameter(Mandatory = $true)]
        [string[]]$EmployeeId,

        [parameter(Mandatory = $true)]
        [string[]]$GroupId,

        [parameter(Mandatory = $true)]
        [string[]]$GroupName

• UserId & EmployeeId are mutually exclusive
• GroupId & GroupName are mutually exclusive

All of them are mandatory; read: At least one of, UserId or EmployeeId; At least one of, GroupId or GroupName.

Another way to look at it; A & B are mutually exclusive; C & D are mutually exclusive

• A - UserId
• B - EmployeeId
• C - GroupId
• D - GroupName

Possible Combinations I want:

• AC

• AD

• BC

• BD

I have tried to use multiple parameter sets to accomplish this but I am clearly not doing something correctly. I can't seem to work out the correct combination of parameter sets. I did see several example posts on this topic and tried to apply it to this use case; I was not successful.

The list of "possible combinations" is your list of parameter sets - now you just need to apply them to each relevant parameter:

function Test-ParamSet {
    param(
        [Parameter(Mandatory = $true, ParameterSetName = 'UserIdGroupId')]
        [Parameter(Mandatory = $true, ParameterSetName = 'UserIdGroupName')]
        [string[]]$UserId,

        [Parameter(Mandatory = $true, ParameterSetName = 'EmployeeIdGroupId')]
        [Parameter(Mandatory = $true, ParameterSetName = 'EmployeeIdGroupName')]
        [string[]]$EmployeeId,

        [Parameter(Mandatory = $true, ParameterSetName = 'UserIdGroupId')]
        [Parameter(Mandatory = $true, ParameterSetName = 'EmployeeIdGroupId')]
        [string[]]$GroupId,

        [Parameter(Mandatory = $true, ParameterSetName = 'UserIdGroupName')]
        [Parameter(Mandatory = $true, ParameterSetName = 'EmployeeIdGroupName')]
        [string[]]$GroupName
    )

    $PSCmdlet.ParameterSetName
}

Resulting in the following parameter set resolution behavior:

PS ~> Test-ParamSet -UserId abc -GroupId 123
UserIdGroupId
PS ~> Test-ParamSet -UserId abc -GroupName 123
UserIdGroupName
PS ~> Test-ParamSet -EmployeeId abc -GroupId 123
EmployeeIdGroupId
PS ~> Test-ParamSet -EmployeeId abc -GroupName 123
EmployeeIdGroupName