Bluetooth needs PIN Codes for all devices

I hope my question is correct in this section.
I have disabled the internal Bluetooth of my notebook and connected a USB Bluetooth dongle. Now should always specify a PIN code when connecting. However, I have no codes for my headphones (Marshall Minor 3) or keyboard (Keychron K8). With the internal Bluetooth I did not have this problem.
Do I have to set up anything or set a permission so that the Bluetooth dongle works correctly and allows connections without PIN code?

Thanks for a hint or help
Mr. Psyc

CPU: quad core Intel Core i7-8550U (-MT MCP-) speed/min/max: 1400/400/4000 MHz
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Bus 001 Device 004: ID 0bda:8771 Realtek Semiconductor Corp. Bluetooth Radio