Dude just make default
Bluetooth AVRCP version
Bluetooth audio codec
And so on ... Just make everything default then turn off developper options your device reboot & it starts automatically connected to bluetooth device play song's
Bro if you look closely that thread is for official Android 10 from Xiaomi And I'm Asking For Costom ROMs. This Is Worse than misunderstanding.its the ultimate representation of Sarcasm ?