When you add a device by scanning QR code or add it manually, if the adding result page shows it has been added to another account, you need to unbind it from its current account first before you can add it to your account. The device unbinding functionality is useful when you need to add a device to a new account but have no access to delete it from the old account (e.g., if you forgot the password of the old account).
Make sure the phone on which the Mobile Client runs are on the same LAN with the device. Otherwise, this function will be unavailable.
If you checked Allow Me to Disable Hik-Connect Mobile Client Remote Use when you hand over a site to your customer, you cannot unbind the devices added to this Site. For details about site handover, see Hand Over Site by Transferring.
Tap Unbind on the adding result page, and then enter the device password and tap Finish to unbind it from its currently-added account. When the device is unbound, you can add it to your account.
If the device firmware does not support device unbinding, you are required to enter a CAPTCHA code after entering device password.