I guess the I2C address 0x60 which the scanner found was either for the ECC608 crypto chip or for the NINA-W132 WiFi BLE module. The full data sheet for the ECC608 is available only under a non disclosure agreement, but from the summary it appears that its I2C address can be programmed and the default address is not stated. From the NINA-W132 (R05) datasheet, if I read it correctly, the pins which are connected to the I2C bus are marked as reserved for future use!