*** This bug is a duplicate of bug 1871794 ***
    https://bugs.launchpad.net/bugs/1871794

As workaround a mix between Oliver's solution and this in the duplicated
thread
(https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1871794/comments/25)
worked for me on Ubuntu 20.04 / kernel 5.4.0-42-generic / MSI Prestige
14

I removed from my system /lib/firmware/intel/ibt* and copied
/lib/firmware/intel/ibt* inside linux-firmware_1.183.2_all.deb
(http://archive.ubuntu.com/ubuntu/pool/main/l/linux-firmware/linux-
firmware_1.183.2_all.deb)

Didn't have to make any changes to /etc/pulse/default.pa but reverted
the audio configuration to default by removing ~/.config/pulse

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https://bugs.launchpad.net/bugs/1878194

Title:
  [Sennheiser HD 4.50 BTNC] Bluetooth headset not working when selecting
  HSP/HFP audio profile in Focal Fossa

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