If your 123inkcartridges.ca coupon code is not working, there could be a few reasons. First, ensure you have entered the coupon code correctly, including any capitalization or spacing. If the code is not working, check the expiration date to ensure it is still valid. Additionally, some coupon codes may only be valid for specific products or services, so make sure that the code you are using applies to the item you are trying to purchase. If you still need help, please contact our customer care team.