Using this forum and the post from EZPZBZ , I also bought a $300 gift e-card from gits.marriott.com on June 15, 2021. The gift card was emailed to my own name, but I used a second email address for recipient. I got the gift card email immediately, saw the $300 charge on AmEx Bonvoy Brilliant the next day, and after 3 days total I now see the $300 credit, which zeroed out the cost. Might need to add 2 more days if there's a weekend or holiday. Hooray!