ADB doesn't recognize my phone.

After I type "adb devices" it says "list of devices" and leaves a blank line. It doesn't work since I flashed PixelOS. But when I connect my tablet it shows up like it's supposed to.

I'm trying to root it with Magisk because wallet doesn't work. https://blog.pixelos.net/docs/guides/HowToRoot But at some point it just aborts operation. I guess it's because of adb not connecting properly.

If you recognize any of this, please help.