Can't buy RP with Gift Cards (Canadian $)

I wanted to buy the project pass with the money I have left on multiple subway cards, like I used to do some years ago, but it seems I can't buy any RP with gift cards anymore it gives me this message : Fatal error
Unable to process payment for this merchant.

Like the link I sent you above. The gift cards payment method works if I change my country to United state, but by doing so I can't use my gift cards because there is no valid option from the cards I own.