Ms Graph RestAPI create team 404 - microsoft-graph-api

Question

the first try catch works, he is adding the ms graph AD group in office365.
But the second try catch (converting the group to a Team does not work. I receive an 404 error??
The groupID exists on the server I notice.
Whats going wrong to get an 404?
I did add a secret token on the azure control panel.
The script has the token, appid and tenantid in live time.
also: the tenant has graph roles like group.ReadWriteAll. same for Teams and Directories.
Clear-Host
$env:graphApiDemoAppId = "" # Replace with your Azure AD app id
$env:graphApiDemoAppSecret = "" # Replace with your Azure AD app secret
$env:tenantId = "" # Replace with your Azure AD tenant ID
$oauthUri = "https://login.microsoftonline.com/$env:tenantId/oauth2/v2.0/token"
# Create token request body
$tokenBody = #{
client_id = $env:graphApiDemoAppId
client_secret = $env:graphApiDemoAppSecret
scope = "https://graph.microsoft.com/.default"
grant_type = "client_credentials"
}
# Retrieve access token
$tokenRequest = Invoke-RestMethod -Uri $oauthUri -Method POST -ContentType "application/x-www-form-urlencoded" -Body $tokenBody -UseBasicParsing
# Save access token
$accessToken = ($tokenRequest).access_token
$headers = #{
"Authorization" = "Bearer $accessToken"
"Content-type" = "application/json"
}
try
{
# Create group request body
$groupName = "Test_Kenvh16"
$groupBodyParams = #{
displayName = $groupName
description = $groupName
mailNickName = $groupName
groupTypes = #("Unified")
mailEnabled = $true
securityEnabled = $false
visibility = "Private"
}
$groupBody = ConvertTo-Json -InputObject $groupBodyParams
$newGroup = Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/groups" -Method POST -Headers $headers -Body $groupBody
$groupId = $newGroup.id
Write-Host "group created:" $groupName "id:" $groupId
try
{
#convert group to team..
$teamBodyParams = #{
memberSettings = #{
allowCreateUpdateChannels = $true
}
messagingSettings = #{
allowUserEditMessages = $true
allowUserDeleteMessages = $true
}
funSettings = #{
allowGiphy = $true
giphyContentRating = "strict"
}
}
$teamBody = ConvertTo-Json -InputObject $teamBodyParams
$teamUri = "https://graph.microsoft.com/v1.0/groups/" + $groupId + "/team"
$newTeam = Invoke-RestMethod -Uri $teamUri -Method POST -Headers $headers -Body $teamBody
$teamId = $newTeam.id
}
catch
{
Write-Host "createTeam ExceptionMessage:" $_.Exception.Message
Write-Host "createTeam StatusCode:" $_.Exception.Response.StatusCode.value__
Write-Host "createTeam StatusDescription:" $_.Exception.Response.StatusDescription
}
}
catch
{
Write-Host "createGroup ExceptionMessage:" $_.Exception.Message
Write-Host "createGroup StatusCode:" $_.Exception.Response.StatusCode.value__
Write-Host "createGroup StatusDescription:" $_.Exception.Response.StatusDescription
}