Of the eight external tamper pins available on the STM32MP13, only the following lines are available on the ConnectCore MP13, multiplexed with other functionality:

GPIO Tamper pin Notes

GPIOA_IO06

TAMP_IN2

Used on the ConnectCore MP13 Development Kit for USB_PWR

GPIOB_IO02

TAMP_IN7

unused

GPIOF_IO10

TAMP_IN1

unused

GPIOI_IO01

TAMP_IN2 / TAMP_OUT3

Used on the ConnectCore MP13 Development Kit for LPO_32K on SOM variants with Wi-Fi

GPIOI_IO03

TAMP_IN4 / TAMP_OUT5

Used on the ConnectCore MP13 Development Kit for ETH1_RX_ER
To use a pad as tamper pin, you must disable drivers with multiplexed functionality on the default device tree.