After updating to Plasma 6. my bluetooth was disabled for some reason.
Sharing the output of what @anthony93 suggested in post 6 will help with better identifying the issue to hand.
In addition to the above, sharing the output of inxi --bluetooth might also help.
@Balder In this instance, I might recommend the following small change. Otherwise a reboot is needed.
sudo systemctl enable --now bluetooth.service
@duckOSisme Can you confirm that all of the bluetooth packages are installed for your DE? Are you trying to do this via terminal or GUI?