If you have more than one account in the same device, most especially as it has different KYC documents linked to them, they ask for facial verification if session has timed out. I believe it is a form of fraud control to ensure the account is still operated by the person that provided KYC.
Having different Binance accounts on the same device with different KYC documents? How is this possible? I have gone for subaccounts before on few exchanges and I have registered more than one account on exchanges like Mexc which does not request for KYC from me, but it has not gotten to the extent that I will register two accounts with different KYC documents.
Yes, it's very possible. The person only needs to use a different email and register it in a different device and link KYC documents, afterwards you use the switch account feature and login into the second account having included the email in your own device. You can then switch between accounts since the app retains them all. I've had up to 4 before, I don't know if it can allow more. But it surely works fine.
You can even link the second account KYC documents from your own device if you wish. I've helped someone complete her KYC from my device before now.
As long as you don't use the same KYC documents for multi accounting which is against Binance rules, you don't have much of a problem.
You have a point on how it functions, I believe Oshosondy didn't wait to confirm before jumping on conclusions on it not being possible. I would also add that it is not the best practice to manage much assets on a centralized platform, maybe you can teach your people about self-custody.
I kinda did those shits in the past before I knew the beauty of self-custody. It is better having more hardware wallets and cold storages to manage assets than multiple CEX accounts.
This is not about jumping to conclusion, I have helped many people to register an account on many exchanges before and also taught them how to make use of the exchange. In fact few of the people are now on this forum. But I use their own device to register their account for them.
At least, if someone do not have a laptop, the person will have at least an Android or iOS phone which are both good to open an account on Binance. So I have not opened two accounts or more accounts on any exchanges before with two documents or more documents before on my device, also it is not what that I can do and I will advise against it.
So this is not about making conclusion. I use my device only for my own exchanges and Binance have not asked me for any facial verification before. It is just my own opinion and not conclusion and not a mistake but you can further explain how it happened to you just like DubemIfedigbo001 has explained, that is the reason we are here on this forum, to know more about what is happening about crypto, exchanges and other things that we are discussing about.