Edited October 23, 2019
at 11:15 AM
Note*: this offer is best for people who have already upgraded to Ultimate using one of the recent offers and want to extend the life of their Ultimate subscription. I would not use it as my initial upgrade.
I noticed on the Taco Bell app there was an offer to receive 14 days of Xbox Game Pass Ultimate for free with the online or in-app purchase of a $5 Double Chalupa Box. I purchased a $5 box and later received an email with a code I had to input to access the actual 14-day code. After getting the 14-day code, I went to my Xbox account on the microsoft website, put it in, and it offered me an extra full month for turning on recurring billing. I received the extra month for a total of 44 days, and then was free to turn off recurring billing.
I ordered another $5 box on the app a couple days later, and received another email with another code, so I redeemed that too and got the free month for turning on recurring billing. Grand total of 88 days of xbox game pass ultimate for ordering food I was going to order anyway.
It seems there's no limit to the codes you can receive as long as your $5 boxes are in separate online or in-app orders. Offer ends 11/23/19 at 8:59:59 PM PT.
Pics included are of the offer found on the Taco Bell website and of the email I received with my code blurred out.