Autoumber attribute in Dynamics 365 using power-shell scripts

# This PS snippet is to create or update autonumber attribute.

# The User  Name, Password and the Organization Name are to be updated before executing this.

Install-Module -Name Microsoft.Xrm.Data.Powershell -RequiredVersion 2.8.7 -Scope CurrentUser

$password = ConvertTo-SecureString "***" -AsPlainText -Force

$credentials = New-Object System.Management.Automation.PSCredential("username@domain.com",$password)

$crmOrg = Get-CrmConnection -Credential $credentials -DeploymentRegion NorthAmerica -OnlineType Office365 -OrganizationName "dev-dev"  -MaxCrmConnectionTimeOutMinutes 5

function CreateUpdateAutonumberAttribute {

    param ( 

        [Parameter(Position=0, Mandatory=$true)][string]$AttributeName,

        [Parameter(Position=1, Mandatory=$true)][string]$AttributeDisplayname,

        [Parameter(Position=2, Mandatory=$true)][string]$EntitySchemaname,

        [Parameter(Position=3, Mandatory=$true)][string]$AutoNumberFormat,

[Parameter(Position=4, Mandatory=$true)][string]$Message

    )

 try{

  Write-Output "Processing autonumber attribute $AttributeName ..."

  $autonumattribute = New-Object Microsoft.Xrm.Sdk.Metadata.StringAttributeMetadata

  $autonumattribute.SchemaName = $AttributeName

  $autonumattribute.LogicalName = $AttributeName

  $autonumattribute.DisplayName = New-Object Microsoft.Xrm.Sdk.Label($attributedisplayname,1033)

  $autonumattribute.Format = [Microsoft.Xrm.Sdk.Metadata.StringFormat]::Text

  $autonumattribute.MaxLength = 100

  $autonumattribute.AutoNumberFormat = $AutoNumberFormat 

  if($message -eq 'create'){

  $request = New-Object Microsoft.Xrm.Sdk.Messages.CreateAttributeRequest

  }

  elseif($message  -eq 'update'){

  $request = New-Object Microsoft.Xrm.Sdk.Messages.UpdateAttributeRequest

  }

  

  $request.Attribute = $autonumattribute

  $request.EntityName = $EntitySchemaname

  $response = $crmOrg.Execute($request)   

  Write-Output "... autonumber attribute $AttributeName Processed."  

  return $response

 }

 catch { 

   Write-Warning -Message $_.Exception.Message

 }

}

CreateUpdateAutonumberAttribute -AttributeName 'accountnumber' -AttributeDisplayname 'Account Number' -EntitySchemaname 'account' -AutoNumberFormat '{DATETIMEUTC:yyyyMMddhhmmss}' -Message 'update'