Tying to get the Bluetooth connectivity disconnected, I did reboot multiple times until finally I could accomplish that. Like always after rebooting I could connect the sound to my Bluetooth device, but after shutting the device off and wanting to reconnect no sound came into the Bluetooth device. And https://www.bluetoothspeaker.top/bluetooth-speaker-support-bluetooth-tf-usb-with-a-wireless-microphone-function/