Did a search but couldn't find anything. If:
- I'm a Platinum Honors member
- My wife is not a Platinum Honors member, but we have a joint bank account (that on its own would not qualify for Platinum Honors status)
- Her ATM fees are being refunded when she withdraws from that account (as if she were a Platinum Honors member)
- I make her an authorized user on my Premium Rewards card
Would she then earn 2.625% cashback?