Can't connect to Android 9 TV over ADB (wired or wireless)

Question

I connected my Android 9 TV to my laptop running Windows 11 via a USB cable (new, just out of the package) since I want access to the Logcat of the TV. ADB over network (running adb connect IP:5555) was not working before, it is not working now either: cannot connect to <IP>:5555: No connection could be made because the target machine actively refused it. (10061) When running adb tcpip 5555 I get the output error: no devices/emulators found.

I am able to connect to TVs running other Android versions; I tested with Android 7 and 10, both worked flawlessly without needing a USB cable even.

USB Debugging is enabled. I have tried restarting the adb server (adb server-kill, adb server-start), using Android Studio's built-in connection troubleshooter, re-installing SDK Tools; nothing seems to work. I tried restarting both my laptop and the TV several times, toggling USB debugging. No success unfortunately. The platform-tools folder is located in C:\Users\User\AppData\Local\Android\Sdk\platform-tools, it is on Path in System Variables. The folder contains adb.exe.

Frankly, I am out of ideas and am desperately looking for any advice.