AMEX authorized User bonus Master Thread

[justmeha]

ok, we all know that if you wait around long enugh with a amex card you will get a offer to get bonus points for adding au and spending 500 i think this program needs it own thread so here it goes.......
has anybody got the email after adding other au without a bonus ?
thanks

[justmeha]

[Targeted] American Express: Add An Authorized User & Get 20,000 Points

[yitzgar]

Delta blue card:

You could both benefit when you add Additional Card Members:
Earn 5,000 bonus miles
Share benefits of your Delta SkyMiles Blue American Express Card with your spouse, child, or favorite cousin. When you add Additional Card Members, they can enjoy many of the perks you do, and you can earn 5,000 bonus miles after one Additional Card Member spends $500 in eligible purchases on their Card in the first six months of Card Membership.1

Offer ends 10/31/2021.

[yitzgar]

Is there a limit to how many au's you can get the bonus for?