Powershell to add groups to enterprise app with no role?

I am trying to add groups to an enterprise app with no role. some of the powershell groups are deprecated, and i cannot find a good way to hit the endpoint.

i get an error with calling

New-MgServicePrincipalAppRoleAssignment

Install-Module Microsoft.Graph.Applications
Import-Module Microsoft.Graph 
Import-Module Microsoft.Graph.Authentication
Import-Module Microsoft.Graph.Applications
Import-Module Microsoft.Graph.Groups

# Connect to Microsoft Graph
$EnterpriseAppObjectId = ""
Connect-MgGraph -Identity -nowelcome

Write-Output "Connected. Fetching Enterprise App..."
$sp = Get-MgServicePrincipal -ServicePrincipalId $EnterpriseAppObjectId -ErrorAction Stop
Write-Output "Enterprise App Found: $($sp.DisplayName)"

# Get existing group assignments
Write-Output "Fetching currently assigned groups..."
$existingAssigned = Get-MgServicePrincipalAppRoleAssignedTo -ServicePrincipalId $EnterpriseAppObjectId -All
$existingIds = $existingAssigned.Id

Write-Output "Found $($existingIds.Count) existing group assignments."

# Fetch matching groups
Write-Output "Searching for groups starting with 'Agile_'..."
$groups = Get-MgGroup -Filter "startsWith(displayName,'Agile_')" -All

if (-not $groups) {
    Write-Output "No matching groups found. Exiting."
    return
}

Write-Output "Found $($groups.Count) Agile_* groups."

foreach ($group in $groups) {

    if ($existingIds -contains $group.Id) {
        Write-Output " → Skipping existing group: $($group.DisplayName)"
        continue
    }

    Write-Output "`nAdding NEW group assignment: $($group.DisplayName) ($($group.Id))"

    try {
        New-MgServicePrincipalAppRoleAssignment `
            -ServicePrincipalId $EnterpriseAppObjectId `
            -PrincipalId $group.Id `
            -AppRoleId "00000000-0000-0000-0000-000000000000" `
            -ResourceId $group.Id

        Write-Output " ✔ Successfully assigned: $($group.DisplayName)"
    }
    catch {
        Write-Output " ✖ Failed to assign $($group.DisplayName): $_"
    }
}

Write-Output "`nCompleted processing all Agile_* groups."