Don't waste your time with their promo codes

Ubereats bombards your email account with promo codes. Everytime I try to use them, it either says : "Oops, this promotion could not be claimed" or "Promotion code is not valid" Like today's promo code emailed to me 'SUNDAY75OFF' fails both manual entry as well as the auto "Redeem Now" from the email. Waste of time !!!!