Fair point - didn’t realize the authorized user fee for Business Platinum was that much higher.

In the case of a Personal Platinum account, the traveler must be the primary account holder or a Platinum authorized user to receive the IAP rate at anytime. If the authorized user holds the complimentary Gold card, they will only receive the IAP rate when traveling with the primary account holder.

I would think IAP terms are fairly similar across the different Amex Platinum flavors, but would be good to have confirmation from a Business Platinum holder.