Can I upgrade someone else's flight Qatar?

To benefit from the upgrade offer, you must be at least 21 years of age and have the capacity to enter into binding contracts. If you are acting on behalf of someone else, you must also have the authority to act on behalf of, and bind the person(s) eligible for the upgrade offer, to these terms and conditions.

https://divx.zendesk.com/hc/en-us/community/posts/26778248124055