Urgent Issues-arduino nano with electrochromic film and SEN0348 dfrobot fingerprint sensor project

Hello. I am creating a credit card shaped device which uses 3V battery-powered electrochromic switchable smart film (a paper-like material which turns transparent when on and opaque when off). I am using a SEN0348 DFRobot fingerprint sensor with the ID809.h library to control the switchable film's on and off function. After a fingerprint is enrolled on startup, the fingerprint scanner should act like a switch and turn on the film (transparent) if recognised. If not recognised, the film stays as is (blurred). I am currently using a breadboard but would like to remove that eventually.

I am unsure of how to wire the film, there are two 15 by 15 (cm) HOHOFILM film pieces which run on two AA batteries, 3V I believe. Also, the battery pack has a button to turn film on/off, so I don't of how to simulate the fingerprint sensor causing the switch instead of the button. The film has two wires, a red positive and black negative. The But I have checked the schematics of the SEN0348 and I'm pretty sure that has been wired correctly. I am using an official Arduino Nano A000005. In the end, I would like everything to be powered by a separate power supply as the credit card case has to be portable obviously.

The main issue I am facing right now is with the fingerprint sensor. When I open the serial monitor, the fingerprint sensor initializes and starts to try and enroll even if my finger is not on the sensor. Also, I don't see any LED light up on the fingerprint sensor (don't know if the SEN0348 has an LED). So whenever I open serial monitor and whether place my finger on the sensor or not, the sensor goes ahead and tries to enroll but the serial monitor says: Failed to enroll fingerprint. Error: 255. I cannot find anything online about this issue. I have bulb shaped two pin LEDs to test with instead of the film, but I don't know if the wiring will be the same.

Please help me wire the electrochromic film and solve the Error Code 255 problem.

Code:

<#include <DFRobot_ID809.h>

DFRobot_ID809 fingerprintSensor;

const int ELECTROCHROMIC_FILM_PIN = 9;
bool printFlag = false;            // Flag to indicate whether to print the message or not
unsigned long lastPrintTime = 0;   // Variable to store the time of the last print

void setup() {
    Serial.begin(9600);
    while (!Serial);

    fingerprintSensor.begin(Serial);  // Use Serial for UART communication
    Serial.println("Fingerprint sensor initialized!");

    pinMode(ELECTROCHROMIC_FILM_PIN, OUTPUT);

    Serial.println("Place your finger on the sensor to enroll an initial fingerprint:");
    enrollFingerprint();  // Enroll a fingerprint during setup
}

void loop() {
    if (Serial.available()) {
        char command = Serial.read();
        if (command == 'e') {
            enrollFingerprint();  // Allow manual enrollment if needed
        }
    }

    if (fingerprintSensor.detectFinger()) {
        if (fingerprintSensor.search()) {
            Serial.println("Fingerprint match found!");
            digitalWrite(ELECTROCHROMIC_FILM_PIN, HIGH);
            Serial.println("Electrochromic film activated!");
            delay(60000);
            digitalWrite(ELECTROCHROMIC_FILM_PIN, LOW);
            Serial.println("Electrochromic film deactivated.");
        } else {
            if (!printFlag) {
                Serial.println("Fingerprint not recognized!");
                lastPrintTime = millis(); // Update the last print time
                printFlag = true;         // Set the print flag to true
            }
        }
    }

    // Check if 5 seconds have passed since the last print
    if (millis() - lastPrintTime >= 5000) {
        // Reset the print flag after 5 seconds
        printFlag = false;
    }

    delay(50);
}

void enrollFingerprint() {
    Serial.println("Place your finger on the sensor for enrollment:");

    int id = fingerprintSensor.getEmptyID();  // Find an empty ID to store the fingerprint
    if (id == -1) {
        Serial.println("No empty ID available.");
        return;
    }

    while (!fingerprintSensor.collectionFingerprint(id)) {
        delay(100);
        Serial.println("Place your finger again.");
    }

    Serial.println("Fingerprint data being processed...");
    delay(2000);

    int result = fingerprintSensor.storeFingerprint(id);
    if (result == 0) {
        Serial.println("Fingerprint enrolled successfully!");
    } else {
        Serial.println("Failed to enroll fingerprint. Error: " + String(result));
    }
}

Wiring connections (fingerprint sensor to nano):
Yellow with yellow jumper(TX) to Nano RX0 pin
Black with brown jumper (RX) to Nano TX1 pin
White with white jumper (power/3.3V) to Nano 3.3V pin
Red with orange jumper (GND) to Nano GND pin
Green and Blue unused

Electrochromic film link: Amazon Electrochromic 15cmx15cm Film HOHOFILM
Fingerprint sensor link: DFRobot SEN0348 fingerprint sensor