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Are you able to contact them and ask them to unlock it?
If so, I can provide instructions -- but they'll need to have access to it, since it's their own iPhone.
(Usually, it pays to be cautious about purchasing used iPhones or iPads -- they can be stolen, and sold, but then the buyer -- you -- gets stuck with a locked device.
However if the previous owner/user is still available, then they can change & unlock that setting for you.
Please let me know the situation and we can proceed!
Apologies for the delay.)