There are a few reasons why you cannot use Amazon reward points to purchase a PlayStation Plus membership. First, Amazon reward points can only be used on Amazon.com, not on any other website. Second, Amazon reward points can only be used to purchase items that are sold and shipped by Amazon.com, not by third-party sellers. Finally, Amazon reward points cannot be used to pay for taxes or shipping charges.
PlayStation Plus memberships are not sold on Amazon.com, so you cannot use Amazon reward points to purchase one. PlayStation Plus memberships are also not sold by Amazon.com, so you cannot use Amazon reward points to pay for a membership. You can, however, use Amazon reward points to purchase PlayStation Plus gift cards, which can be used to pay for a PlayStation Plus membership.