A Pro Plan needs to be looked after constantly – not every user is aware of that. Amazon now has this new “feature” that nobody has a clue about.

If there haven’t been any sales for a period of 90 days, or any activity on your Amazon account, then the Pro will turn off automatically and the account will be switched to an Individual plan. At the same time, Amazon will duly inform you that the conversion of the plan has been completed at your request.
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Doesn’t sound good, right? That’s why it’s very important to be active at least once every 90 days! One transaction is enough.
If there are no transactions within 6 months, Amazon will require a re-verification of the contact person to return to the Pro plan.
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Please be careful buying accounts from people you are not sure about, especially if the account is older than 6 months. You could buy a PRO, and after the purchase it will turn out that you need verification. This process is compulsory if the account has already rolled back to an Individual.
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There is always a risk that you will not be able to add products, even with the active listing status. The result - Account Suspended 🤷🏻‍♂️