Create M365 Group, Team, and Channel in PowerShell Using Microsoft Graph API

TeamsAndGraphApi.ps1

# Configure app registration and tenant information
$env:graphApiDemoAppId = "12345678-abcd-efgh-jklm-123456789abc"   # Replace with your Azure AD app id
$env:graphApiDemoAppSecret = "1234567890asdfjk;l54321"            # Replace with your Azure AD app secret
$env:tenantId = "12345678-abcd-efgh-ijkl-987654321wxyz"           # 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 value
$accessToken = ($tokenRequest).access_token

# Set request headers with access token and content-type
# This will be used in each request to the Graph service as long as the $accessToken is valid
$headers = @{
  "Authorization" = "Bearer $accessToken"
  "Content-type" = "application/json"
}

# Create request body with M365 group properties
$groupBody = 
'{
    "displayName":  "Team from Graph API Demo",
    "mailNickname":  "teamfromgraphapidemo",
    "description":  "Demo making a group from Graph API",
    "[email protected]":  [
                              "https://graph.microsoft.com/v1.0/users/{id}"  # Use object ID or UPN of user
                          ],
    "groupTypes":  [
                       "Unified"
                   ],
    "mailEnabled":  "true",
    "securityEnabled":  "false",
    "visibility": "Private"
}'

# Invoke request again Graph service to create group
$newGroup = Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/groups" -Method POST -Headers $headers -Body $groupBody

# Create the request body with team properties
$teamBody =
'{
  "memberSettings": {
    "allowCreateUpdateChannels": true,
    "allowDeleteChannels": true,
    "allowAddRemoveApps": true,
    "allowCreateUpdateRemoveTabs": true,
    "allowCreateUpdateRemoveConnectors": true    
  },
  "guestSettings": {
    "allowCreateUpdateChannels": true,
    "allowDeleteChannels": true 
  },
  "messagingSettings": {
    "allowUserEditMessages": true,
    "allowUserDeleteMessages": true,
    "allowOwnerDeleteMessages": true,
    "allowTeamMentions": true,
    "allowChannelMentions": true    
  },
  "funSettings": {
    "allowGiphy": true,
    "giphyContentRating": "strict",
    "allowStickersAndMemes": true,
    "allowCustomMemes": true
  }
}'

# Invoke request again Graph service to create team based on the previously created M365 groups
$newTeam = Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/groups/$($newGroup.id)/team" -Method PUT -Headers $headers -Body $teamBody

# Create the request body with channel properties
$channelBody = 
'{
  "displayName": "Channel from Graph API",
  "description": "Demo how to make a channel using graph api"
}'

# Invoke request against Graph service to create a channel in the previously created team
$newChannel = Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/teams/$($newTeam.id)/channels" -Method POST -Headers $headers -Body $channelBody

Hello, first of all congratulations on your work.
But I have a question, how do you create a private channel in Teams?
I'm trying but is impossible for me.

`
$PrivateChannel = @{
displayname = 'test2'
description = 'test2'
membershiptype = 'private'
members = @{
'@odata.type = '#microsoft.graph.aaduserconverstionmember'
'[email protected]' = 'https://graph.microsoft.com/beta/users($IdUser)
roles = 'owner'
}
}

$PrivateChannelJson = ($PrivateChannel | convertto-json)

Invoke-RestMethod -Headres $authHeader -Uri "https://graph.microsoft.com/beta/teams/$IdTeams/channels" -Method Post -ContentType 'application/json' -Body $PrivateChannelJson
`

And the answer is Error: (400) Bad Request

Check out this link, looks like you might be missing the "@odata.type": "#Microsoft.Graph.channel" property.

Create a private channel on behalf of a user