Walmart+/Sam's Club Plus combo not honoring AARP discount

Walmart has been touting their new partnership with Sam’s Club plus as a way for Walmart+ members to receive additional savings. I hoped to take advantage of this (we need all the help we can get) but found out they will not honor the $40 AARP discount for the Walmart+ membership I have. They will revert and prorate the cost of my current Walmart+ membership eliminating the discount and then add on the extra for Sam’s Club Plus. Renewal will be at the full $120 - no discount. Why isn’t AARP stepping up for us? These are 2 separate memberships and the discount should be honored. Instead I am being asked to pay more. Not what I call savings.