I fixed the problem for my laptop.
it looks like its a configuration issue in /etc/pulse/default.pa file.
I simply made a diff with a previous ubuntu version aka 19.10 and adjust the 
config (I copied the config file ) and restart pulseaudio with "systemctl 
--user restart pulseaudio".
and my hsp/hfp profile now works and I can use the microphone as well.

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https://bugs.launchpad.net/bugs/1576559

Title:
  Refused to switch profile to headset_head_unit: Not connected

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