Please note that you will need to be travelling on a KLM-operated or on an international SkyTeam-operated flight on that same day or on a domestic SkyTeam-operated flight that connects to or from a SkyTeam-operated international flight on the same day.
Your flight has to be a KLM-operated or SkyTeam-operated flight.
Hence, any WestJet operated flight will not grant you lounge access.