im having trouble with shipping for supporter pack.

hi i bought the lord of ogham supporter on steam and i want to upgrade to the thaumaturge of the vaal supporter in game but when i try to opt in for the shirt and add my address i get an argument was invalid next to shipping and when i try to do on the site i get You will not receive physical goods for this payment package. is there any way to make this work so i can get the shirt?