Comment by saint_yossarian

Distros do have manuals, they just usually come in the form of user-curated wikis these days. ArchWiki is usually my first stop when I run into a Linux issue, even as a fellow Debian user.

Both https://wiki.archlinux.org/title/Bluetooth and https://wiki.debian.org/BluetoothUser mention rfkill and show you how to troubleshoot.