08-30-2022 12:19 PM - edited 08-30-2022 12:20 PM
Do the sellers other items show shipping to Canada through the gsp? If so, it's possible that the gsp does not ship that particular item here or that the gsp accidentally got dropped off of that listing....that does happen. No one can help you it is the first problem.
If it is the second problem, ask the seller if they will go into that particular listing to make sure that it is set up with the gsp. Unfortunately, some sellers may not know how to do that and/or they are just not good at troubleshooting. If they are unable to help you make the purchase, you might have to find another seller