I really hope this helps:
I had a customer coming and asking to help her with her Soundcore Earbuds (no idea which model). Her Microphone wouldn´t get added, but only Sound would be transferred to her Earbuds.
We removed the device through the Bluetooth Settings (the three dots in the right upper corner of your device).
Then go to the System > Sound > Input (!!!) Settings.
Add a Device.
In the best case the Microphone gets installed, the Speaker get installed, and you can finally start using your Earbuds for Video Conferencing.
Br, Chacky.
IT WORKED!!!! After trying everything this fixed it for me. Hope it helps for others too