Got this offer in my Amex Experience app, and found out it is “App Exclusive Additional Card Offer”, seems like you need to download Amex Experience app and this offer is only for platinum card holders!
Exclusive Limited Time Platinum Experiences App Offer
Add an Additional Card by 31 May and receive 15,000 Bonus Points on your first approved Card.
The Primary Card Member named above will receive 15,000 Bonus Points when they apply for an Additional Card by clicking on the link on the Platinum Experiences App Offer by 31 May 2024. This offer is limited to the first approved Additional Card added. 15,000 Bonus Points will be awarded to the Primary Card Member's Account 8 – 10 weeks after the Additional Card is approved. This advertised offer is not applicable or valid in conjunction with any other advertised or promotional offer.
What's an Amex Experience app? Is this different from the Amex AU one?