As I stated above, the minimum criteria is an active account for a minimum 90 days with at least one sale and a pro seller subscription (not necessarily from outset).
This is based on my experience.
BB eligibility can come before 90 days for fbm sellers if you have a certain amount of fb's and a pro plan
#8
03-24-2019
Beautiful
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Re: FBM buybox eligible stealth accounts
I've seen it many times before 90 days as well, its truly random at least on newly verified stores