It should not do that. If you mean it doesn't engage when you tug the switch make sure your foot is on the brake.
If any of the following conditions occurs while the AUTOHOLD function is operating (AUTOHOLD active indicator light is turned on), the parking brake is applied automatically and the AUTOHOLD function turns off. For the Electric Parking Brake (EPB) operation, refer to the Electric Parking Brake (EPB) on page 4-94.
-The ignition is switched OFF.
-There is a problem with the AUTOHOLD function.