Create Microsoft Teams with default channel, add owner, and users

CreateTeams.ps1

param(

[Parameter(Mandatory=$false)]
[string] $TeamName = 'Test Team',

[Parameter(Mandatory=$false)]
[string] $TeamDescription = 'New MS Team',

[Parameter(Mandatory=$false)]
[string] $Visibility = 'Private',

[Parameter(Mandatory=$false)]
[string] $UPIId = 'neeraj@azure-training.com',

[Parameter(Mandatory=$false)]
[string[]] $Users
)

# Enforcing validation of code
Set-StrictMode -Version Latest

function CreateMSTeamsTeamGAPI{

    Connect-AzAccount -Identity
    $tenantID = '<tenant id>'
    $clientId = '<client id>'
    $clientSecret = '<client secret>'
    
    try{
        $graphtokenBody = @{
            Grant_Type    = "client_credentials"
            Scope         = "https://graph.microsoft.com/.default"
            Client_Id     = $clientId
            Client_Secret = $clientSecret
        }
        $graphtoken = Invoke-RestMethod -Uri "https://login.microsoftonline.com/$tenantID/oauth2/v2.0/token" -Method POST -Body $graphtokenBody | Select-Object -ExpandProperty Access_Token

        $teamstokenBody = @{   
            Grant_Type    = "client_credentials"   
            Scope         = "48ac35b8-9aa8-4d74-927d-1f4a14a0b239/.default"   
            Client_Id     = $clientId   
            Client_Secret = $ClientSecret 
        } 

        $teamsToken = Invoke-RestMethod -Uri "https://login.microsoftonline.com/$TenantID/oauth2/v2.0/token" -Method POST -Body $teamstokenBody | Select-Object -ExpandProperty Access_Token 

        Connect-MicrosoftTeams -AccessTokens @("$graphToken", "$teamsToken")

        $TeamExists = Get-Team -DisplayName $TeamName
        If($TeamExists){
            write-output "This Team with name $TeamName already Exists. The request has been marked as closed incoleted and a new task has been created"
        }
        else{
            Connect-AzureAD -TenantId $tenantID -ApplicationId $clientId -CertificateThumbprint $Thumbprint
            $UPN = Get-AzureADUser -ObjectID $UPIId
            if ($UPN -ne $null){
                $group = New-Team -DisplayName $TeamName -Description $TeamDescription -Visibility $Visibility -Owner $UPIId
                if((!$Users.count -eq 0) -or (!$Users -eq ''))
				        {
                    foreach($TeamMember in $Users){
                        Add-TeamUser -GroupId $group.GroupId -User $TeamMember
                    }
                }
                write-output "New Team created with name - " + $TeamName + ". Request has been Completed."
            }
            else{
               write-output "This Team owner UPN $UPIId does not exists in Azure AD. Please p[rovide a valid owner detail"
            }
        }
    }

    Catch{
        write-output $_.Exception.ToString()
    }
}

# Initiate the variable here
##################################
[string] $Thumbprint = Get-AutomationVariable -Name 'CERT_THUMBPRINT'
#####################################
# call the function to provision email id
#####################################
CreateMSTeamsTeamGAPI
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