ULPT Request: Multi-accounting w/ meal prep delivery service isn't working?

I switch between a number of meal prep kit deliveries (they offer good discount codes if you cancel and come back). I now have a bunch of "free box" codes for brand new members.

I tried creating a new account to be able to use a "free box" code. It seemed to work all the way until I click "place order", and then it said the "coupon code does not apply"- like they caught onto what I'm doing.

I took all of the following precautions already:

• Different name
• Different email address (obviously)
• Different unit number (I have to keep the same street address- but there are other people in my building that also use it so I don't see why it wouldn't work)
• Different credit card
• Different phone number
• Brand new laptop (hasn't ever accessed that website yet)

I've seen other Reddit posts saying it works for them- what am I missing??