I didn't think it was a different subject as that post quoted the OP who wanted to book under his account and use the wife's card to pay and get the $200 credit.

You are correct that you cannot book on Amex travel using 2 names. You can only use the name of the account you are booking under. OP didn't have a need to book using both names as it was useless for his wife to be on it if she was not going to be there