code: def check_media_service_name_availability(access_token, subscription_id, msname):
      '''Check media service name availability.
  
      Args:
          access_token (str): A valid Azure authentication token.
          subscription_id (str): Azure subscription id.
          msname (str): media service name.
  
      Returns:
          HTTP response.
      '''
      endpoint = ''.join([get_rm_endpoint(),
                          '/subscriptions/', subscription_id,
                          '/providers/microsoft.media/CheckNameAvailability?',
                          'api-version=', MEDIA_API])
      ms_body = {'name': msname}
      ms_body['type'] = 'mediaservices'
      body = json.dumps(ms_body)
      return do_post(endpoint, body, access_tokenf check_media_service_name_availability(access_token, subscription_id, msname):
      '''Check media service name availability.
  
      Args:
          access_token (str): A valid Azure authentication token.
          subscription_id (str): Azure subscription id.
          msname (str): media service name.
  
      Returns:
          HTTP response.
      '''
      endpoint = ''.join([get_rm_endpoint(),
                          '/subscriptions/', subscription_id,
                          '/providers/microsoft.media/CheckNameAvailability?',
                          'api-version=', MEDIA_API])
      ms_body = {'name': msname}
      ms_body['type'] = 'mediaservices'
      body = json.dumps(ms_body)
      return do_post(endpoint, body, access_token)
docs: Check media service name availability.
  
      Args:
          access_token (str): A valid Azure authentication token.
          subscription_id (str): Azure subscription id.
          msname (str): media service name.
  
      Returns:
          HTTP response.