Amazon $15 off $50 using at least 1 Citi “Thank You” Point – New Promo – YMMV

Most likely targetted so YMMV.
New Promo with new activation page. Works with third party gift cards.
https://www.amazon.com/b?node=18198682011
Terms and Conditions:
This promotion starts at 12:00am PST on August 1, 2019 and ends on the earlier of (i) at 11:59pm PST on 12/31/2019, or (ii) when 31,096 offers have been redeemed, or (iii) when Amazon elects to end the promotion.
Offer is available by invitation only, is non-transferable, is not redeemable for cash, and may not be resold.
Amazon reserves the right to modify or cancel this offer at any time.
Offer only applies to products sold by Amazon.com (Look for "sold by Amazon.com" or "sold by Amazon Digital Services LLC" on the product detail page). Products sold by third-party sellers or other Amazon entities will not qualify for this offer, even if "fulfilled by Amazon.com" or "Prime Eligible".
Offer applies only to the purchase of items made with an eligible Citi Card, where ThankYou Points are used for at least a portion of the purchase and the promotion code is activated. When you click on the ‘Click to activate’ button your Citi ThankYou Points will be temporarily set as default payment method at checkout for a duration of six hours, unless you manually update your payment option. The promotion remains valid even after the temporary default setting lapses, until the end of the promotion period.
Offer does not apply to digital content.
Products must be purchased in a single order with the same method of shipment to a single address. Shipping charges and taxes may apply to the full value of discounted promotional items.
Offer may not be combined with other offers.
The maximum benefit you may receive from this offer is $15.
Offer discount will be allocated proportionally among all promotional items in your order. If any of the items in your order are subsequently returned, your refund will equal the original price of the product, less the proportional amount of the discount. The total discount on the unreturned amount of your original order will then be less than $15.00.
Promotional discount may not be redeemed for Amazon.com Gift Cards.
If you violate any of these terms, the offer will be invalid.