Magenta Max Promos will remain active while upgrade to Go5G plan

I have 3 lines on Magenta Max. The account has multiple promotions codes. I would like to upgrade the account to Go5G Plus plan. I would like to understand will the current promotions on the account continue post upgrade?

I am not getting a consistent feedback from the TMobile.. Some executive says the promotions will continue post upgrade as the promotion codes are eligible in the Go5G Plus plan and some executive mentioned that the promotion may fall off, but they can’t guarantee whether the promotion will continue. 

I need an affirmation so that I can make a informed decision.

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