AccessToken (Bearer) from an existing Azure PowerShell session

Get-AzureRmCachedAccessToken.ps1

function Get-AzureRmCachedAccessToken()
{
  $ErrorActionPreference = 'Stop'
  
  if(-not (Get-Module AzureRm.Profile)) {
    Import-Module AzureRm.Profile
  }
  $azureRmProfileModuleVersion = (Get-Module AzureRm.Profile).Version
  # refactoring performed in AzureRm.Profile v3.0 or later
  if($azureRmProfileModuleVersion.Major -ge 3) {
    $azureRmProfile = [Microsoft.Azure.Commands.Common.Authentication.Abstractions.AzureRmProfileProvider]::Instance.Profile
    if(-not $azureRmProfile.Accounts.Count) {
      Write-Error "Ensure you have logged in before calling this function."    
    }
  } else {
    # AzureRm.Profile < v3.0
    $azureRmProfile = [Microsoft.WindowsAzure.Commands.Common.AzureRmProfileProvider]::Instance.Profile
    if(-not $azureRmProfile.Context.Account.Count) {
      Write-Error "Ensure you have logged in before calling this function."    
    }
  }
  
  $currentAzureContext = Get-AzureRmContext
  $profileClient = New-Object Microsoft.Azure.Commands.ResourceManager.Common.RMProfileClient($azureRmProfile)
  Write-Debug ("Getting access token for tenant" + $currentAzureContext.Subscription.TenantId)
  $token = $profileClient.AcquireAccessToken($currentAzureContext.Subscription.TenantId)
  $token.AccessToken
}

Hi,
What is the Az module command instead of this AzureRmProfileProvider.
As there is change from microsoft, we need to change existing AzureRm module commands to Az module.
Please let me know what changes needs to be done in above script to migrate to Az module.