Export Intune devices NOT enrolled in any Group Memberships

@Joe Calabria, Thanks for posting in Q&A. From your description, I find you want to get the devices of which its group membership is null. If there's any misunderstanding, feel free to let us know.

Based on my testing, we can use the following script to get the information:

## Requires the Microsoft.Graph.Intune module
Install-Module -Name Microsoft.Graph.Intune
connect-msgraph

## Examples:
$Devices=(Get-IntuneManagedDevice).devicename
write-host "The device without any groupmembership:" 
Foreach ($Device in $Devices)
{

$GroupMembership = Get-DeviceGroupMembership -DeviceName $Device 

If ($GroupMembership -eq $null)
{
write-host $Device
}
    else 
    {
        Return    
    }
}


# Function
function Get-DeviceGroupMembership{
    [CmdletBinding(DefaultParameterSetName='Name')]
    Param(  
    [Parameter(Mandatory=$true,ParameterSetName='Name')]  
    [ValidateNotNullOrEmpty()]  
        [string]$DeviceName,
    [Parameter(Mandatory=$true,ParameterSetName='Id')]  
    [ValidateNotNullOrEmpty()] 
        [string]$AADDeviceId
    )

    $ProgressPreference = 'SilentlyContinue'
    # Get a user token for MS Graph
    $GraphToken = Connect-MSGraph -PassThru

    # Find the object id
    If ($DeviceName)
    {
        $URL = "https://graph.microsoft.com/v1.0/devices?`$filter=displayName eq '$DeviceName'&`$select=id"
    }
    If ($AADDeviceId)
    {
        $URL = "https://graph.microsoft.com/v1.0/devices?`$filter=deviceId eq '$AADDeviceID'&`$select=id"
    }
    $headers = @{'Authorization'="Bearer " + $GraphToken}
    $D_Response = Invoke-WebRequest -Uri $URL -Method GET -Headers $Headers -UseBasicParsing
    If ($D_Response.StatusCode -eq 200)
    {
        # Check for duplicates
        $DeviceId = ($D_Response.Content | ConvertFrom-Json).Value.id
        If ($DeviceId.Count -gt 1)
        {
            Write-Warning "Multiple devices found. Please pass a unique devicename or AAD device Id!"
            Return
        }
        else 
        {
            If ($DeviceId)
            {
                # Get the group membership
                $URL = "https://graph.microsoft.com/beta/devices/$DeviceId/memberOf?`$select=displayName,description,id,groupTypes,membershipRule,membershipRuleProcessingState"
                $G_Response = Invoke-WebRequest -Uri $URL -Method GET -Headers $Headers -UseBasicParsing
                If ($G_Response.StatusCode -eq 200)
                {
                    $Groups = ($G_Response.Content | ConvertFrom-Json).Value 
                }
            }

        }
    }
    else 
    {
        Return    
    }

    # If results found
    If ($Groups.Count -ge 1 -or $TransitiveGroups.Count -ge 1)
    {
        # Create a datatable to hold the groups
        $DataTable = [System.Data.DataTable]::New()
        $Columns = @()
        @(
            'Name'
            'Description'
            'Object Id'
            'Membership Type'
            'Direct or Transitive'
            'Membership Rule'
            'Membership Rule Processing State'
        ) | foreach {
            $Columns += [System.Data.DataColumn]::new("$_")
        }
        $DataTable.Columns.AddRange($Columns)

        # Add the groups
        foreach ($Group in $Groups)
        {
            If (($Group.groupTypes | Select -First 1) -eq "DynamicMembership")
            {$MembershipType = "Dynamic"}
            Else {$MembershipType = "Assigned"}
            [void]$DataTable.Rows.Add($Group.displayName,$Group.description,$Group.id,$MembershipType,"Direct",$Group.membershipRule,$Group.membershipRuleProcessingState)
        }

        # Add the transitive groups
        foreach ($TransitiveGroup in ($TransitiveGroups | where {$_.id -NotIn $Groups.id}))
        {
            If (($TransitiveGroup.groupTypes | Select -First 1) -eq "DynamicMembership")
            {$MembershipType = "Dynamic"}
            Else {$MembershipType = "Assigned"}
            [void]$DataTable.Rows.Add($TransitiveGroup.displayName,$TransitiveGroup.description,$TransitiveGroup.id,$MembershipType,"Transitive",$TransitiveGroup.membershipRule,$TransitiveGroup.membershipRuleProcessingState)
        }

        Return $DataTable
    }
}

Hope the above information can help.

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