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I see where you are supposed to get 24 monthly credits for the second device. While this should be automatic underneath the promotional code you may check with T-Mobile to make sure that the account is set up with that promotional detail. I would not just automatically assume that you will see credits for the next two years on the second device.
It sounds like you're referring to this promotion: LG Phone Deals & Promotions | LG G6 & V30 Deals | T-Mobile right? The automatic credits will take up to 2 billing cycles to begin. If for some reason it takes two billing cycles, you'll see a double credit on the bill. Don't forget to take advantage of the promo being run by LG when purchasing the LG V30.