I received an email today from Hilton offering me 10,000 Hilton points for adding an additional person to my Amex Hilton card account.
To receive these bonus points, the Card Member must add the additional Card using the e-mailed link. The offer for 10,000 Hilton HHonors Bonus Points expires on 7/20/2016. Card Members are limited to receipt of one-time 10,000 Hilton HHonors Bonus Points. Hilton HHonors Bonus Points will be credited to your Hilton HHonors account 6 – 8 weeks after you add an additional Card.
It might be a targeted offer so check your emails to see if you have it. I almost missed it, because I thought it was a referral offer. It was titled “Spread the Word!”.
You can also check this link. Log in with your credentials and see if the offer shows up on the left side. Looks like it’s working for many people, even if they didn’t receive the email, so give it a try. And please let me know in the comments if you’re successful or not.