American Express Membership Rewards - Avis, Hertz & Budget gone from MR redemption?

Two days ago I booked car rental reservations w/ Avis intending to use MR certs as payment.

Today I went back to redeem and Avis, Hertz & Budget are gone... only Thrifty and Dollar are left.

When I search by partner I find Avis, but upon clicking is says "There are currently no rewards that fit your search criteria."

What's going on?

AMEX cust service states "the website is being updated, try back later." But, they they will still be partners.