[Update: Readers confirm in the comments that anyone with an Amex business card can now signup for the new Ebates-MR account directly, no use the method described below.]
The new Ebates – Membership Rewards account was only possible to obtain for those with a personal MR-earning card, it didn’t work for those only with a business card. Reader K. sent in a tip that they were able to signup for the new Ebates account with only a business card via a ‘Special Promotions for You’ link from within their Amex login.
This doesn’t matter for anyone who has personal cards, but if you only have Amex business cards this tip might work for you. It’s also possible that they changed the rule and now allow anyone who has a business card to signup directly. I have no way of testing this myself.

