This iphone is currently linked to an apple id

If you're the device's original owner, take the device and its original purchase receipt to a physical Apple Store.

If not, but you're able to contact the person who set the lock, send them this link and tell them to follow its instructions.

If neither of the above applies, you can't activate the device but may be able to get it refunded. Apple won't remove the lock for anyone other than the original owner(assuming they're alive.)

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Find My iPhone Activation Lock

If you cannot get the previous owner to properly release the device from the activation lock, then you have a permanently "bricked" phone you can never use.