Here are the rules:

"5 All Air Canada benefits are provided to you by Air Canada, its affiliates or other third parties, and are subject to change at any time. The Toronto-Dominion Bank and its Affiliates are not responsible for these benefits. For more details about these benefits, please contact Air Canada directly. With the TD Aeroplan Visa Infinite Card, the complimentary first checked bag up to 23kg (50lbs) applies whenever the Primary Cardholder travels on an Aeroplan flight reward operated by Air Canada, Air Canada Express or Air Canada rouge. Flights operated by other airlines are not eligible. Aeroplan flight rewards are defined as Aeroplan ClassicFlight® or Market Fare flight rewards booked from the Primary Cardholder’s Aeroplan account. The complimentary first checked bag applies solely to the Primary Cardholder, and service charges for additional/oversized/overweight baggage may apply. In order to access these benefits, the Primary Cardholder may be required to show the Card to the Air Canada agent. Please allow two weeks from receiving your Card for these Air Canada benefits to be activated"

Source: https://www.tdcanadatrust.com/produc...edcard-details

The bolding is mine to answer your question.