Group creation no longer provisioning Planner board

$GroupName="NameOfYourGroup"
$upn="someone@somewhere.onmicrosoft.com"
#$upn = $requestBody.upn

$TenantID=Get-AutomationVariable -Name 'TenantID'
$AppID=Get-AutomationVariable -Name 'AppID'
$AppSecret=Get-AutomationVariable -Name 'AppSecret'
# Make email address safe...
$EMail = $GroupName.Trim().Replace(" ","-")

Write-Output "TenantID: $TenantID AppID: $AppID AppSecret: $AppSecret"
Write-Output "GroupName: $GroupName EMail: $EMail UPN: $upn"

function Initialize-Authorization {
param
(
[string]
$ResourceURL = 'https://graph.microsoft.com',

[string]
[parameter(Mandatory)]
$TenantID,

[string]
[Parameter(Mandatory)]
$ClientKey,

[string]
[Parameter(Mandatory)]
$AppID
)

$Authority = "https://login.windows.net/$TenantID/oauth2/token"

[Reflection.Assembly]::LoadWithPartialName("System.Web") | Out-Null
$EncodedKey = [System.Web.HttpUtility]::UrlEncode($ClientKey)

$body = "grant_type=client_credentials&client_id=$AppID&client_secret=$EncodedKey&resource=$ResourceUrl"

# Request a Token from the graph api
$result = Invoke-RestMethod -Method Post `
-Uri $Authority `
-ContentType 'application/x-www-form-urlencoded' `
-Body $body

$script:APIHeader = @{'Authorization' = "Bearer $($result.access_token)" }
Write-Output $result
}

# Initialize Authorization
Initialize-Authorization -TenantID $TenantID -ClientKey $AppSecret -AppID $AppID

# Check if group is already existing
try {
$uri = "https://graph.microsoft.com/v1.0/groups?`$filter=startswith(mail,'$EMail')"

$result = Invoke-RestMethod -Method Get `
-Uri $uri `
-ContentType 'application/json' `
-Headers $script:APIHeader `

# and save the generated Group ID
$GroupID = $result.value.id
Write-Output "GroupID: $GroupID"
} catch {
Write-Output "ERROR! $_"
}

# If $GroupID is empty...
Write-Output "[$GroupID]"
if ([bool]$GroupID)
{
$msg = "EXISTING: $EMail, $GroupID"
}
else
{
$msg = "CREATED: $EMail, $GroupID"

# Create the Office 365 group
$json = @"
{
"description": "$GroupName",
"displayName": "$GroupName",
"groupTypes": [
"Unified"
],
"mailEnabled" : true,
"mailNickname": "$Email",
"securityEnabled" : false,
"visibility" : "Private",
"classification" : "Unclassified"

}
"@

try {
$result = Invoke-RestMethod -Method Post `
-Uri "https://graph.microsoft.com/beta/groups" `
-ContentType 'application/json' `
-Headers $script:APIHeader `
-Body $json `
-ErrorAction Stop

# and save the generated Group ID
$GroupID = $result.id
Write-Output "GroupID: $GroupID"
} catch {
Write-Output "ERROR! $_"
}

# Get the User ID
try {
$OwnerObject = Invoke-RestMethod -Method Get `
-Uri "https://graph.microsoft.com/v1.0/users/$upn" `
-ContentType 'application/json' `
-Headers $script:APIHeader `
-ErrorAction Stop
Write-Output $OwnerObject.UserPrincipalName
} catch {
Write-Output "ERROR! $_"
}

# Add User as Owner
$json = @"
{ "@odata.id": "https://graph.microsoft.com/v1.0/users/$($OwnerObject.id)" }
"@

try {
$result = Invoke-RestMethod -Method Post `
-Uri "https://graph.microsoft.com/v1.0/groups/$GroupID/owners/`$ref" `
-ContentType 'application/json' `
-Headers $script:APIHeader `
-Body $json `
-ErrorAction Stop
Write-Output "Added owner: $GroupID"
} catch {
Write-Output "ERROR! $_"
}

# add user as Member
try {
$result = Invoke-RestMethod -Method Post `
-Uri "https://graph.microsoft.com/v1.0/groups/$GroupID/members/`$ref" `
-ContentType 'application/json' `
-Headers $script:APIHeader `
-Body $json `
-ErrorAction Stop
Write-Output "Added member: $GroupID"
} catch {
Write-Output "ERROR! $_"
}