Samsung Pay doesn't support Mastercard?

It is a debit Master card, it's a gift card though... Not really experienced with cards, been using cash my whole life..
 
I doubt it's going to support that. It's made for your credit and debit cards that are associated with a bank. It's not made for prepaid stuff like that.
 
not that it didn't work before, it's because of the bank that doesn't support it, just like what the helpful peeps said