Resetting Bluetooth keyboard with AA batteries on Tahoe.

Answer: Bluetooth Keyboard, AA batteries, cordless. Suddenly it was discoverable but not connecting to Mac Mini M2 Pro running Tahoe. First reset Bluetooth Daemon: sudo pkill bluetoothd. The re-pair keyboard in System Settings, BUT continue to hold the Powerbutton even after the green light begins to flash. Eventually, the dialog box for entering the numeric pairing code appeared and all is well again.