Using LITE to control an Android (Samsung Galaxy S21) phone?

I'm having problems installing/running RealVNC Server on a Samsung Galaxy S21 phone. It keeps asking for a 9 digit code but I can't even get the device to show up in my team. It's like it will only work in On-Demand mode and I don't know if that's possible with a Lite account? If it isn't possible can someone suggest a better option?