Here is the guide to combine Xhorse FT Mini OBD tool for Toyota with Xhorse App.
Then connect Xhorse FT OBD tool and you will be able to combine it with your account
Go to FT OBD Tool App
Press Select icon
Turn on bluetooth connection and connect FT Mini obd via Bluetooth
FT mini obd is connected
Go to Device information->Combine Device
You will see device is not combined.
App will prompt if there is new firmware database or app update. Keep them up-to-date.