Set-MgGroupLicense - error assignLicense are missing parameters addLicenses

Problème assignLicense are missing parameters addLicenses

The Set-MgGroupLicense command can cause issues when attempting to remove a license from a group by passing an empty list for AddLicenses, even though this is in accordance with the official documentation.

Set-MgGroupLicense_Assign: One or more parameters of the operation 'assignLicense' are missing from the request payload. The missing parameters are: addLicenses.

This error occurs with module 2.26.1 (other versions have not been tested).
For reference, below are the non-working codes:

# Test 1 KO
$groupID = 'xxx
$group = Get-MgGroup -GroupId $groupId -Property AssignedLicenses
$licensesToRemove = $group.AssignedLicenses.SkuId

$params = @{
    addLicenses = @()  # Empty array for addLicenses
    removeLicenses = $licensesToRemove
}

Set-MgGroupLicense -GroupId $groupId -BodyParameter $params

# Test 2 KO
Set-MgGroupLicense -GroupId xxx -AddLicenses @() -RemoveLicenses @('xxx')

# Test 3 KO
Set-MgGroupLicense -GroupId xxx -AddLicenses @{} -RemoveLicenses @('xxx')

Alternative Solution with Invoke-MgGraphRequest

To work around this issue, I used Invoke-MgGraphRequest, which allows direct calls to the Graph API with a properly formatted request body.

Here is a functional PowerShell script:

$groupId = 'xxx'

# Retrieve the group's current licenses
$group = Get-MgGroup -GroupId $groupId -Property AssignedLicenses
$licensesToRemove = $group.AssignedLicenses.SkuId

# Prepare the request body to remove all licenses
$body = @{
    addLicenses    = @()
    removeLicenses = $licensesToRemove
}

# Call the Graph API to remove licenses
Invoke-MgGraphRequest -Method POST -Uri "https://graph.microsoft.com/v1.0/groups/$groupId/assignLicense" -Body ($body | ConvertTo-Json)

This approach avoids the errors encountered with Set-MgGroupLicense and ensures proper functionality.
Hopefully, a future update to the Microsoft.Graph modules will resolve this issue.