Amex are changing how the annual travel vouchers/credit is redeemed.
https://www.americanexpress.com/en-au/travel/how-to-use-trav…
From the FAQs
There are no refunds, including cancelled bookings. If you cancel your travel booking after redeeming the annual Travel Credit, you will not be able to use it again in the same anniversary year.
I don't like this. Plans sometimes change, emergencies disrupt travel plans.
Could be the start of phasing out these annual travel credits.
I’d rather get $0 annual fee.