This time, Emirates took action. Sujit Kumar Hota (Sujit da, tweet link: here) posted on Twitter that someone sent him a photo of a form titled "Redemption Ticket Interception Report."
A passenger was asked to fill out the form and provide proof that the miles used to upgrade their flight were not purchased from a third-party seller.
In the end, the passenger was allowed to fly on their original ticket in economy class, the upgrade was not honored and the third-party seller's account—used to sell the miles—was blocked.
Air miles are not meant for resale, and we’ve seen similar cases in the past. Turkish Airlines, Vistara, and a few others have also taken action, preventing passengers from flying on vouchers or miles bought from third-party sellers.
This is a great step toward stopping the unauthorized trade of air miles. Hopefully, such checks will become more common. If you trade or buy air miles from third-party sellers, be careful—you could face trouble.

A passenger was asked to fill out the form and provide proof that the miles used to upgrade their flight were not purchased from a third-party seller.
In the end, the passenger was allowed to fly on their original ticket in economy class, the upgrade was not honored and the third-party seller's account—used to sell the miles—was blocked.
Air miles are not meant for resale, and we’ve seen similar cases in the past. Turkish Airlines, Vistara, and a few others have also taken action, preventing passengers from flying on vouchers or miles bought from third-party sellers.
This is a great step toward stopping the unauthorized trade of air miles. Hopefully, such checks will become more common. If you trade or buy air miles from third-party sellers, be careful—you could face trouble.