After receiving this email, i thanked them and tried to do a request and viola, i can now request and use uber with my prepaid card (debit card). I think that all debit cards can work on uber, if you receive a message on the app saying "deem invalid" i don't think that your card is invalid. Uber system just found it irregular as using a debit card doesn't have a credit automation unlike a credit card. Uber system can't charge it automatically so it is flagging it as invalid. 

But emailing UBER will help on this concern, a support will look on it and going to reinstate your account after a few hours and you can now use your debit card in UBER Manila. 

Notice: Again i think every debit card will work as long as you successfully add the debit card on your account, and if it says deem invalid, then contact uber right away, so they can reinstate your account. Just make sure you have enough balance to cover a ride. To be safe you need at least P500 on that debit card, so you won't have any trouble in the future.

I hope i have helped you as a rider in this concern. Have you signed up on uber yet as a rider? If not you can use my referral code by clicking here. If you are a first time rider on uber you'll get P200 extra credit for your ride.

Btw the image above is the proof that i can now use my prepaid card/debit card to request rides in UBER and I'm really sorry fellow partner sir Kristoffer that i have requested a ride and cancelled it for the purpose of this experiment. I know how frustrating this is for you and I am really sorry :(