serial object not receiving data from Arduino

Hello dear forum,

having a problem with serial
When I send data from Arduino to its IDE all is monitored fine.
But wenn I try to receive it in max via the serial object, I don't receive any data

what I already tried:
- printing serial port (the only thing that worked)
- all max documentation and tutorials within max that I could find (don't work because serial doesn't receive any data)
- either running IDE and or max, but not both at once (problem remained)
- all max/arduino tutorials I could find on the internet (didn't solve my problem)

even though the serial object prints out the port, when I send a message "print" to it, I still can't receive any data from the serial object. I tried all Max code snippets for that which I could find in this forum, but I get the same result: no incoming messages, no matter what.

Could there be a problem with my security

Max8.5.2
system: Max M1 chip
Arduino Uno Wifi Rev2

Max Code:

Arduino Code:

int val[6]; //Array. 6 sensors total

void setup() {

Serial.begin(9600); // Serial communication set up

}

void loop() {

//Read analog inputs one by one and send them to MaxMSP

for(int i = 0; i < 6; i++){

val[i] = analogRead(i);

Serial.print(val[i]);

Serial.print(" ");

}

Serial.println();

delay(10);

}