Device name of a Linux system required for identifying it as an "allowed device" on a WiFi hotspot?

I want to add a Linux system to the white list of a WiFi mobile hotspot running on Android. Doing hostnamectl returns, amongst other information, a Static hostname, an Icon name, a Machine ID, and a Boot ID. Which of these is the right one? I got the MAC address of the wlan0 interface by doing ip addr in the terminal and added it, together with the Static hostname, to the white list, but the connection fails. Signal strength is very good and the WPA2 password is correct. PS.: On a Windows 10 machine, you get the corresponding name by doing hostname in the command line or looking it up in Settings > System > About under "Device name".